PCI Express x16 Graphics 150W-ATX Specification Revision 1.0

Transcription

1 PCI Express x16 Graphics 150W-ATX Specification Revision 1.0 October 25, 2004

2 Revision Revision History Date 1.0 Initial release. 10/25/04 PCI-SIG disclaims all warranties and liability for the use of this document and the information contained herein and assumes no responsibility for any errors that may appear in this document, nor does PCI-SIG make a commitment to update the information contained herein. Contact the PCI-SIG office to obtain the latest revision of the specification. Questions regarding this specification or membership in PCI-SIG may be forwarded to: Membership Services administration@pcisig.com Phone: Fax: Technical Support techsupp@pcisig.com DISCLAIMER This specification is provided as is with no warranties whatsoever, including any warranty of merchantability, noninfringement, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification, or sample. PCI-SIG disclaims all liability for infringement of proprietary rights, relating to use of information in this specification. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted herein. PCI-SIG and PCI Express are trademarks of PCI-SIG. All other product names are trademarks, registered trademarks, or servicemarks of their respective owners. Copyright 2004 PCI-SIG 2

3 Contents OBJECTIVES OF THE SPECIFICATION...5 REFERENCE DOCUMENTS...5 DOCUMENTATION CONVENTIONS...5 TERMS AND ACRONYMS INTRODUCTION SYSTEM IMPLEMENTATION USAGE RULES SYSTEM POWER DELIVERY REQUIREMENTS GRAPHICS CARD POWER POWER-UP SEQUENCING PCI EXPRESS X16 GRAPHICS 150W-ATX POWER CONNECTOR DEFINITION POSITION POWER CONNECTOR SYSTEM PERFORMANCE REQUIREMENTS POSITION PCB HEADER Position R/A Thru-Hole PCB Header Assembly Position R/A Thru-Hole Header Recommended PCB Footprint Position R/A SMT PCB Header Assembly R/A SMT Header Recommended PCB Footprint POSITION CABLE ASSEMBLY CONNECTOR MATING-UNMATING KEEP-OUT AREA (LATCH LOCK RELEASE) POSITION POWER CONNECTOR SYSTEM PIN ASSIGNMENT ADDITIONAL CONSIDERATIONS MECHANICAL SPECIFICATION PCI EXPRESS X16 GRAPHICS 150W-ATX ADD-IN CARD DIMENSIONS ADD-IN CARD MOUNTING GRAPHICS CARD RETENTION THERMAL MANAGEMENT

4 Figures FIGURE 2-1: EXAMPLE ORIENTATION FOR X16 GRAPHICS 150W-ATX CARDS... 9 FIGURE 3-1: PCI EXPRESS X16 GRAPHICS 150W-ATX POWER-UP SEQUENCE FIGURE 4-1: 6-POSITION R/A THRU-HOLE PCB HEADER FIGURE 4-2: 6-POSITION R/A THRU-HOLE HEADER RECOMMENDED PCB FOOTPRINT FIGURE 4-3: R/A SMT PCB HEADER FIGURE 4-4: SMT HEADER RECOMMENDED PCB FOOTPRINT FIGURE 4-5: CABLE CONNECTOR HOUSING FIGURE 4-6: CONNECTOR MATING-UNMATING KEEP-OUT AREA (LATCH LOCK RELEASE) FIGURE 4-7: X16 GRAPHICS 150W-ATX POWER CONNECTOR FIGURE 5-1: PCI EXPRESS X16 GRAPHICS 150W-ATX ADD-IN CARD DIMENSIONAL DRAWING 26 FIGURE 5-2: DETAILED TWO-SLOT I/O BRACKET DESIGN FIGURE 5-3: TWO-SLOT I/O BRACKET EXAMPLE (ISOMETRIC VIEW) Tables TABLE 2-1: POWER SUPPLY RAIL REQUIREMENTS TABLE 4-1: X16 GRAPHICS 150W-ATX POWERCONNECTOR PIN-OUT TABLE 4-2: PCI EXPRESS X16 GRAPHICS 150W-ATX POWER CONNECTOR ADDITIONAL REQUIREMENTS TABLE 5-1: PCI EXPRESS X16 GRAPHICS 150W-ATX ADD-IN CARD DIMENSIONS

5 Objectives of the Specification The objectives of this specification are as follows: Support for PCI Express graphics add-in cards that are higher power than specified in the PCI Express Card Electromechanical Specification Forward looking for future scalability Allow evolution of the PC architecture including graphics Upgradeability Enhanced end user experience This specification contains the follow information: System requirements Power delivery Graphics add-in card electrical budget Supplemental power connector specification Card form factors and implementation Reference Documents PCI Express Base Specification, Rev. 1.1 (PCI Express Base 1.1) PCI Express Card Electromechanical Specification, Rev. 1.1 (PCI Express CEM 1.1) PCI-SIG Engineering Change Notices (ECNs) Documentation Conventions Capitalization Some terms are capitalized to distinguish their definition in the context of this document from their common English meaning. Words not capitalized have their common English meaning. When terms such as memory write or memory read appear completely in lower case, they include all transactions of that type. Register names and the names of fields and bits in registers and headers are presented with the first letter capitalized and the remainder in lower case. Numbers and Number Bases Hexadecimal numbers are written with a lower case h suffix, e.g., FFFh and 80h. Hexadecimal numbers larger than four digits are represented with a space dividing each group of four digits, as in 1E FFFF FFFFh. Binary numbers are written with a lower case b suffix, e.g., 1001b and 10b. 5

6 Binary numbers larger than four digits are written with a space dividing each group of four digits, as in b. All other numbers are decimal. Implementation Notes Implementation Notes should not be considered to be part of this specification. They are included for clarification and illustration only. Terms and Acronyms add-in card A card that is plugged into a connector and mounted in a chassis slot AGP Accelerated Graphics Port ATX A system board form factor. Refer to the ATX Specification, Rev ATX-based form factor Refers to a form factor that does not exactly conform to the ATX specification, but uses the key features of ATX, such as the slot spacing, I/O panel definition, etc. ECN Engineering Change Notice evolutionary strategy A strategy to develop the PCI Express connector and card form factors within today s chassis and system board form factor infrastructure constraints 6

7 1 1. Introduction This specification is a PCI Express x16 Graphics 150W-ATX-specific document that addresses graphics power and thermals greater than those supported by PCI Express CEM 1.1. Its purpose is to provide additional capabilities for PCI Express graphics within the existing framework of an evolutionary strategy that is based on existing system board form factors. This specification is primarily designed to deliver additional electrical power to a PCI Express graphics add-in card and provide increased card volume for the management of thermals. The recent completion of Revision 1.0 of the Balanced Technology Extended (BTX) Interface Specification is acknowledged as an important upcoming form factor. The support of PCI Express 150W in a BTX system was considered during the development of this specification, and it was agreed to that the initial version should target the ATX form factor. As graphics power and thermal requirements have risen over time, the targeted application for this specification is broadened over the technology (AGP) that it replaces. As such, the PCI Express x16 Graphics 150W-ATX Specification is intended to support both workstation and consumer graphics. This specification directly leverages PCI Express CEM 1.1 and PCI Express Base 1.1. Only deltas from, or additions to, required areas for support of x16 150W-ATX Graphics are provided. Together, PCI Express CEM 1.1 and this specification support three distinct maximum power levels for graphics: 25 W (low profile card), 75 W (standard size), and 150 W (as described in this specification). In order to achieve maximum interoperability and a non-compromised end user experience, intermediate power levels leveraging optional components of PCI Express Base 1.1 are outside the scope of the PCI Express electromechanical specifications. This specification does not support the optional hot-plug functionality of PCI Express CEM

8 8 PCI EXPRESS X16 GRAPHICS 150W-ATX SPECIFICATION, REV. 1.0

9 2 2. System Implementation A PCI Express x16 Graphics 150W-ATX add-in card is defined as a card that exceeds PCI Express CEM 1.1 power delivery or thermal capability and, as such, consumes greater than 75 W with support for up to 150 W inclusive. This card may use the space of the adjacent expansion slot, thereby providing more volume for thermal solutions and components on the primary side of the card than the standard PCI Express add-in card which is constrained to the width of a single expansion slot. A system that supports a PCI Express x16 Graphics 150W-ATX add-in card is required to ensure that sufficient power and thermal support exists. For example, in an ATX form factor system, the adjacent expansion slot can be left vacant allowing for 1.37 inches of clearance for the add-in card as illustrated in Figure 2-1. The area on the add-in card that can utilize this height, as well as the restricted height of the secondary side, is not defined in this specification, rather it leverages the general PCI Express add-in card requirements for these dimensions MAX [1.370] COMPONENT SIDE RESERVED AREA PCI EXPRESS X16 GRAPHICS 150W-ATX GRAPHICS CARD (I/O BRACKET AND END BRACKET REMOVED FOR CLARITY) PCI EXPRESS CONNECTOR [0.800] ALL DIMENSIONS: mm [inches] [0.800] MOTHERBOARD A-0392 Figure 2-1: Example Orientation for x16 Graphics 150W-ATX Cards 9

10 2.1. Usage Rules A PCI Express x16 Graphics 150W-ATX compliant system must provide the extra space required to support a PCI Express x16 Graphics 150W-ATX add-in card. A PCI Express x16 Graphics 150W-ATX add-in card plugs into the standard x16 PCI Express connector but is not permitted to plug into any other adjacent add-in card connectors for any purpose. A PCI Express x16 Graphics 150W-ATX add-in card can draw a maximum of 75 W through the standard connector as specified in PCI Express CEM 1.1. Additional power, up to 75 W, is provided through an additional connector that is detailed in this specification. Therefore, the maximum power that must be provided to a PCI Express x16 Graphics 150W-ATX add-in card is 150 W System Power Delivery Requirements A system that supports a PCI-Express x16 Graphics 150W-ATX add-in card can deliver the +12 V to the standard x16 connector and the additional +12 V via the dedicated power supply connector from the same or different rails in the power supply. This is up to the discretion of the system designer. For add-in card requirements, refer to Chapter 3. Table 2-1 provides the required specifications for the power supply rails available at the PCI Express graphics slot and the x16 Graphics 150W-ATX power connector. The system designer is responsible for ensuring that the power delivered to the PCI Express connectors meets the specifications called out in Table 2-1. Table 2-1: Power Supply Rail Requirements Power Rail 75 W Slot 150W-ATX Power Connector Remarks +12V Voltage Tolerance ±8% +5% / -8% (max) The maximum voltage variation between +12V inputs is 1.92 V. Supply Current 5.5 A (max) 6.25 A (max) IMPLEMENTATION NOTE PCI Express Slot Requirements 75 W slot requirements are defined in PCI Express CEM 1.1. PCI Express x16 Graphics x16 150W-ATX add-in cards must be capable of accommodating the maximum voltage variation between the 75 W slot and 2x3 power connector +12V inputs. 10

11 3 3. Graphics Card Power A PCI Express x16 Graphics 150W-ATX add-in card must adhere to strict power distribution, power-up, and power consumption requirements to ensure robust operation. Power may only be drawn using two techniques: the standard PCI Express connector defined in PCI Express CEM 1.1 and the dedicated x16 Graphics 150W-ATX power connector defined in this specification. It is necessary for a PCI Express x16 Graphics 150W-ATX add-in card to be seamlessly integrated with a x16 Graphics 150W-ATX capable system to ensure interoperability. To that end, it is required that the graphics card be properly powered in the system. To guarantee proper operation and provide a safe user experience, the following power delivery requirements must be adhered to by a PCI Express x16 Graphics 150W-ATX add-in card: The +12V delivered from the standard x16 connector and the additional +12V delivered via the dedicated 2x3 power supply connector must be treated as coming from two separate system power supply rails. The two +12V input potentials must not be electrically shorted at any point on a PCI Express x16 Graphics 150W-ATX add-in card. No specific power sequencing between the slot and 2x3 connector power can be assumed. A PCI Express x16 Graphics 150W-ATX add-in card must handle all possible combinations. IMPLEMENTATION NOTE Safety Certifications PCI Express x16 Graphics 150W-ATX add-in cards and capable systems must adhere to all applicable safety certifications (e.g., UL 240 VA) at all times Power-Up Sequencing The following specified power-up sequencing process permits a PCI Express x16 Graphics 150W-ATX add-in card to sense if the PCI Express x16 Graphics 150W-ATX connector is plugged in and then initially draw up to a maximum of 75 W. This methodology allows a PCI Express x16 Graphics 150W-ATX add-in card to circumvent the 25 W maximum power consumption that is required in PCI Express CEM 1.1 for all x16 add-in cards prior to being enabled for higher power consumption via a Slot Power Limit message. The system power-up sequencing follows the Slot Power Limit Control mechanism as defined in Chapter 6 of PCI Express Base 1.1. An overview of power-up sequencing is shown in Figure

12 Card reset condition (1b) Manage initial power-up to 25 W (1a) Adjust power to a maximum of 75 W Yes (2a) Is x16 graphics 150W-ATX power connector attached? (2) No (2b) Adjust power to a maximum of 25 W Review slot power limit value (3) Review slot power limit value (4) Value = 150 W (3a) Value = 25 W (3c) Value = 150 W (4a) Value = 25 W (4c) Power draw can be increased to 150 W Value = 75 W (3b) Maintain power draw at 75 W Power draw can be increased to 75 W Value = 75 W (4b) Maintain power draw at 25 W Figure 3-1: PCI Express x16 Graphics 150W-ATX Power-Up Sequence 1. Initial power-up or reset condition. a. At initial power-up, manage maximum power to <= 25 W maximum for sensing of the PCI Express x16 Graphics 150W-ATX power connector. b. An add-in card cannot remember a previous power limit setting through a reset. A card that has been reset must start the process over again as with initial power application. (Total power in this state will be dependent on the Slot Power Limit Value prior to the reset.) 2. Detect if a PCI Express x16 Graphics 150W-ATX power connector is plugged into the add-in card using the allocated Sense pin. a. Yes. If the connector is installed, then the PCI Express x16 Graphics 150W-ATX add-in card can be adjusted to a combined maximum of 75 W of power using the PCI Express x16 Graphics 150W-ATX power connector and the x16 connector. In this situation, a maximum of 25 W can be drawn from the x16 connector. Proceed to step 3. b. No. If the PCI Express x16 Graphics 150W-ATX power cable is not connected, then power consumption must be adjusted to a maximum of 25 W. Proceed to step 4. A

13 3. Review Slot Power Limit Value. PCI Express x16 Graphics 150W-ATX power connector was sensed. a. Value = 150 W. If the received slot power message indicates 150 W, a PCI Express x16 Graphics 150W-ATX add-in card can proceed to draw up to a maximum of 150 W. This is a total of 75 W from the PCI Express x16 connector and 75 W via the dedicated PCI Express x16 Graphics 150W-ATX power connector. b. Value = 75 W. If the received slot power message indicates 75 W, power consumption must be maintained at a combined maximum of 75 W of power using the PCI Express x16 Graphics 150W-ATX power connector and the x16 connector. In this situation, a maximum of 25 W can be drawn from the x16 connector. c. Value = 25 W. If the received slot power message indicates 25 W or if no slot power message is received, then power consumption must be maintained at a combined maximum of 75 W of power using the PCI Express x16 Graphics 150W-ATX power connector and the x16 connector. In this situation, a maximum of 25 W can draw from the x16 connector. 4. Review Slot Power Limit Value. PCI Express x16 Graphics 150W-ATX power connector was not sensed. a. Value = 150 W. If the received slot power message indicates 150 W, power consumption can be increased to a maximum of 75 W via power from the x16 connector. b. Value = 75 W. If the received slot power message indicates 75 W, power consumption can be increased to a maximum of 75 W via power from the x16 connector. c. Value = 25 W. If the received slot power message indicates 25 W or if no slot power message is received, total graphics power must be managed to a maximum of 25 W at all times. IMPLEMENTATION NOTE Power-up Sequencing Configuration Issues Steps 3b, 3c, 4a, 4b, and 4c above are configurations in the power-up sequencing for a PCI Express x16 Graphics 150W-ATX add-in card that result in less than the full 150 W of power being available to the add-in card. Any graphics operation and actual display to a connected output device, whether VGA or otherwise, at less than 150 W is not guaranteed and is implementation dependent. However, it is preferred that at least an implementation supplied warning text message is displayed to alert the user of the configuration issue. 13

14 IMPLEMENTATION NOTE Power Distribution and Consumption PCI Express x16 Graphics 150W-ATX add-in cards must follow a stringent set of rules for power distribution to the card and power consumption of the card. Drawing power from the system in any way that is not specified is not allowed as is consuming power above the maximum of 150 W. 14

15 4 4. PCI Express x16 Graphics 150W-ATX Power Connector Definition This chapter defines the PCI Express x16 Graphics 150W-ATX powerconnector and cable assembly Position Power Connector System Performance Requirements The power connector system performance requirements are as follows: Current Rating: 8.0 amperes per pin/position maximum to a 30 C T-Rise above ambient temperature conditions at 12 VDC, all six contacts energized Mated Connector Retention: N minimum when plug pulled axially Position PCB Header Position R/A Thru-Hole PCB Header Assembly Figure 4-1 shows the details of a 6-position, R/A thru-hole PCB header assembly. 15

16 4.2 TYP [0.165] 3.4 MIN [0.134] 1.07 ± 0.02 SQ [0.042 ± 0.001] 13.8 ± 0.25 [0.543 ± 0.009] 3.6 TYP MIN [0.142] 3.17 ± 0.15 [0.125 ± 0.006] 1.4 ± 0.15 [0.055 ± 0.006] 4.2 [0.165] 3.6 TYP MIN [0.142] 11.4 ± 0.25 [0.449 ± 0.009] 0.95 ± 0.25 TYP [0.037 ± 0.009] 1.7 ± 0.25 TYP [0.066 ± 0.009] POSITION #1 INDICATOR 7.3 TYP REF [0.287] 4.2 TYP REF [0.165] 18.1 ± 0.25 REF [0.713 ± 0.009] 9.1 [0.358] 5.3 [0.209] ALL DIMENSIONS: mm [inches] A-0394 Figure 4-1: 6-Position R/A Thru-Hole PCB Header R/A Thru-Hole PCB Header Assembly Notes: Housing Material: Thermoplastic, 94V-0 rated; Color: black Pin Contact Base Material: Brass alloy or equivalent Pin Contact Plating: Sn alloy Connector Polarization: Per Figure

17 Position R/A Thru-Hole Header Recommended PCB Footprint Figure 4-2 shows the recommended PCB footprint for a 6-position, R/A thru-hole header. EDGE OF PCB 5.04 REF [0.198] SEE NOTE 1 RECEPTACLE OUTLINE [1.333] HEADER OUTLINE NON PTH Ø 3 ± 0.05 TYP [Ø ± 0.002] 8.4 [0.331] Ø 0.1 [0.004] M ALL DIMENSIONS: mm [inches] 7.3 TYP [0.287] 4.2 TYP [0.165] Ø 1.8 ± 0.08 PTH TYP [Ø ± 0.003] Ø 0.1 [0.004] M 4.2 TYP [0.165] Figure 4-2: 6-Position R/A Thru-Hole Header Recommended PCB Footprint A

18 Position R/A SMT PCB Header Assembly Figure 4-3 shows the details of a 6-position, R/A SMT header assembly ± 0.25 [0.740 ± 0.010] B C 3.4 MIN [0.134] 2.61 REF [0.103] A 1.07 [0.042] ± SQUARE 0.20 [0.008] ± M A B C 3.6 TYP MIN [0.142] REF [0.504] 3.17 ± 0.15 [0.125 ± 0.006] 1.4 ± 0.15 [0.055 ± 0.006] 4.20 [0.165] 3.6 TYP MIN [0.142] 3.19 REF [0.126] 0.95 ± 0.25 TYP [0.037 ± 0.010] 1.7 ± 0.25 TYP [0.067 ± 0.010] A 4.20 [0.165] POSITION #1 INDICATOR 8.40 [0.331] REF [0.801] REF [1.159] REF [0.868] 6.40 REF [0.252] 1.80 ± 0.25 [0.070 ± 0.010] ± 0.25 [0.449 ± 0.010] A 5.3 ± 0.25 [0.209 ± 0.010] 9.1 ± 0.35 [0.358 ± 0.014] ALL DIMENSIONS: mm [inches] SECTION: A-A Figure 4-3: R/A SMT PCB Header R/A SMT Header Notes: Housing Material: Thermoplastic, 94V-0 rated; Color: black Pin Contact Base Material: Brass alloy or equivalent Pin Contact Plating: Sn alloy Connector Polarization: See Figure 4-3 A

19 R/A SMT Header Recommended PCB Footprint Figure 4-4 shows the recommended PCB footprint for a 6-position, R/A SMT header. DATUM Z BOTTOM SURFACE OF PCB DATUM Y TOP EDGE OF PCB 25 REF [0.984] (KEEP-OUT AREA) SEE NOTE [0.730] 5.49 ± 0.1 TYP [0.216 ± 0.004] 0.10 [0.004] L Z Y X 47 REF [1.850] (KEEP-OUT AREA) SEE NOTE REF [0.198] SEE NOTES 1 AND 2 DATUM X SIDE EDGE OF PCB [0.790] 9.08 [0.357] 4.15 ± 0.1 TYP [0.163 ± 0.004] 0.10 [0.004] Z X Y MATED PAIR CONNECTOR AREA (REF) 6.5 REF [0.256] (KEEP-OUT AREA) SEE NOTE REF [1.201] (KEEP-OUT AREA) SEE NOTE ± 0.1 TYP [0.299 ± 0.004] 0.08 [0.003] Z X Y 1.8 ± 0.1 TYP [0.071 ± 0.004] 4.2 [0.165] 0.08 [0.003] L Z Y X 8.4 [0.331] NOTES: 1. KEEP-OUT DIMENSIONS SHOWN ARE BASED ON R/A HEADER PLACEMENT RELATIVE TO TOP EDGE OF PCB AND ARE FOR REFERENCE PURPOSES ONLY. 2. THIS RECOMMENDED PCB FOOTPRINT LOCATION ON THE GRAPHICS CARD IS BASED ON A SPECIFIC CONNECTOR PLACEMENT OF 5.04 mm FROM THE TOP EDGE OF THE PCB TO THE BACK SURFACE OF THE MATING CABLE ASSEMBLY HOUSING AS SHOWN ABOVE AND IS FOR REFERENCE PURPOSES ONLY. 3. THIS RECOMMENDED PCB FOOTPRINT IS BASED ON THE R/A SMT HEADER CONFIGURATION SHOWN IN FIGURE 5. MODIFICATIONS TO THE R/A SMT HEADER REFERENCE DIMENSIONS (FIGURE 5) MAY REQUIRE A NEW PCB FOOTPRINT DESIGN. 4. ALL DIMENSIONS: mm [inches] Figure 4-4: SMT Header Recommended PCB Footprint A

20 Position Cable Assembly Figure 4-5 shows the cable connector housing. Cable Assembly Housing Details: Housing Material: Thermoplastic, 94V-0 rated; Color: black, special polarization per Figure 4-5 Pin Contact Base Material: Brass alloy or equivalent Pin Contact Plating: Sn alloy 4.2 TYP [0.165] SEE DETAIL A 19.6 ± 0.2 [0.772 ± 0.008] 14.4 ± 0.2 [0.567 ± 0.008] 11.6 ± 0.2 [0.457 ± 0.008] 4.2 TYP [0.165] 13.8 ± 0.2 [0.543 ± 0.008] 6-POSITION KEYING CONFIGURATION DETAIL A SCALE 6:0 ALL DIMENSIONS: mm [inches] POSITION #1, #2, AND #3 INDICATORS Figure 4-5: Cable Connector Housing A

21 Cable Assembly Contact and Wire Details: Wire Size: 18 AWG Cable Bend Radius: 1xR minimum 4.4. Connector Mating-Unmating Keep-Out Area (Latch Lock Release) The connector mating-unmating keep-out area is specified in Figure [0.567] LATCH LOCK WITH MATED CONNECTOR 17.0 REF [0.669] LATCH RELEASE FROM MATED CONNECTOR 2.0 REF [0.079] ALL DIMENSIONS: mm [inches] 19.6 [0.772] 10.7 [0.421] Figure 4-6: Connector Mating-Unmating Keep-Out Area (Latch Lock Release) PCB A

22 Position Power Connector System Pin Assignment Figure 4-7 and Table 4-1 show the pin-out for the PCI Express x16 Graphics 150W-ATX power connector A-0400 Figure 4-7: x16 Graphics 150W-ATX Power Connector Table 4-1: x16 Graphics 150W-ATX PowerConnector Pin-out Pin Signal V V V 4 Ground 5 Sense 6 Ground IMPLEMENTATION NOTE PCI Express x16 Graphics 150W-ATX Power Connector Sense Pin The Sense pin on the PCI Express x16 Graphics 150W-ATX power connector must be connected to ground either directly in the power supply or via a jumper to an adjacent ground pin in the connector. This pin can be used by a PCI Express x16 Graphics 150W-ATX add-in card to detect if the PCI Express x16 Graphics 150W-ATX power connector is plugged. 22

23 4.6. Additional Considerations Table 4-2 lists the additional requirements for the PCI Express x16 Graphics 150W-ATX power connector. Table 4-2: PCI Express x16 Graphics 150W-ATX Power Connector Additional Requirements Parameter Procedure Requirement Flammability UL94V-1 Material certification or certificate of compliance required minimum with each lot to satisfy the Underwriters Laboratories followup service requirements. Lead-free soldering Connector must be compatible with lead free soldering process. Connector Color The color of the connector should be black. Exceptions will be made for color coding schemes that call for a different color of this connector. 23

24 24 PCI EXPRESS X16 GRAPHICS 150W-ATX SPECIFICATION, REV. 1.0

25 5 5. Mechanical Specification The PCI Express PCI Express x16 Graphics 150W-ATX add-in card form factor is based on the add-in card form factor specified in PCI Express CEM 1.1 (see Chapter 6). The primary exception is the restricted component height on the primary side of the card which can extend an additional mm beyond the standard PCI Express CEM 1.1 limit PCI Express x16 Graphics 150W-ATX Add-in Card Dimensions The form factor dimensions for a PCI Express x16 Graphics 150W-ATX add-in card are shown in Table 5-1 and Figure 5-1. Table 5-1: PCI Express x16 Graphics 150W-ATX Add-in Card Dimensions x16 Link Width Height Length Standard height, full length cards mm (4.376 inches) maximum mm ( inches) maximum Component Side Height Restriction mm (1.37 inches) maximum 25

26 34.80 MAX [1.370] RESTRICTED COMPONENT HEIGHT 2.67 MAX [0.105] RESTRICTED COMPONENT HEIGHT COMPONENT SIDE (PRIMARY SIDE) SOLDER SIDE (SECONDARY SIDE) ALL DIMENSIONS: mm [inches] Figure 5-1: PCI Express x16 Graphics 150W-ATX Add-in Card Dimensional Drawing A-0401 IMPLEMENTATION NOTE PCI Express x16 Graphics 150W-ATX Card Length Not all system designs will support 330 mm full length cards. It is strongly recommended that PCI Express x16 Graphics 150W-ATX add-in cards be designed with a mm (9.5 inches) maximum length. 26

27 5.2. Add-in Card Mounting To enable maximum leverage with PCI Express CEM 1.1 (refer to Chapter 6 of that specification), the majority of all form factor dimensions are identical. The only exception is the additional spacing of the restricted component height on the primary side of the card (refer to Chapter 5). A PCI Express x16 Graphics 150W-ATX add-in card may utilize a two slot I/O bracket to accommodate adequate thermal management. Figure 5-2 is a detailed drawing of a two-slot I/O bracket design. Figure 5-3 is an isometric view of the two-slot I/O bracket with an area for graphics card venting. The size and number of any holes in the bracket follow proper EMI and thermal design guidelines [1.525] [1.363] [0.962] 14.3 [0.563] 4.11 [0.162] 0 [0.000] [4.727] [4.446] SEE NOTE [0.101] 3.18 [0.125] 2.54 [0.100] 5.33 [0.210] [1.290] 30 4 PLACES 3.05 [0.120] [0.490] 2.54 [0.100] [1.650] [1.525] Ø 4.42 [Ø 0.174] 2 PLACES 19 [0.748] 0 [0.000] 3.18 [0.125] 5.08 [0.200] 7.24 [0.285] [0.450] [0.201] NOTES: 1. MATERIAL: THK (20 GA) LOW CARBON STEEL, ZINC PLATED 2. TOLERANCES: +/ [0.010] UNLESS OTHERWISE SPECIFIED 3. ALL DIMENSIONS: mm [inches] 4. CROSS HATCH AREA INDICATES I/O CONNECTOR/THERMAL VENTING WINDOW Figure 5-2: Detailed Two-Slot I/O Bracket Design A

28 A-0403 Figure 5-3: Two-Slot I/O Bracket Example (Isometric View) 5.3. Graphics Card Retention The PCI Express x16 Graphics 150W-ATX card leverages many of the features of PCI Express CEM 1.1. The PCI Express x16 Graphics 150W-ATX card has the same outline and board keep out zones for various connector and retention devices. While the connector retention in PCI Express CEM 1.1 and the PCI Express Graphics Card Thermal Mechanical Design Guidelines will work mechanically with the PCI Express x16 Graphics 150W-ATX card form factor, additional card retention and support is required for cards that are greater than 350 grams in mass. Testing has shown that using the connector retention mechanism alone for cards over 350 grams will cause connector and/or card damage. Additionally, use of the hockey stick retention feature defined in PCI Express CEM 1.1 with certain add-in card thermal solutions makes access to and disengagement of the connector retention mechanism difficult without special tools. As a result, the hockey stick feature is optional for a PCI Express x16 Graphics 150W-ATX add-in card. IMPLEMENTATION NOTE PCI Express x16 Graphics 150W-ATX Usage of the Hockey Stick Feature As noted, the Hockey Stick feature defined in PCI Express CEM 1.1 is optional for a PCI Express x16 Graphics 150W-ATX add-in card design. The actual board design used to omit this feature is implementation dependent, but the resultant layout cannot exceed any PCI Express CEM 1.1 outline measurement. 28

29 6 6. Thermal Management Increasing graphics power has a corresponding impact on the thermal management solutions of both the PCI Express x16 Graphics 150W-ATX add-in card and the platforms that support them. To guarantee robust system operation and reliability, the graphics card and system must work together to dissipate the addition thermal load the graphics card puts on the system. It is recommended that the graphics card manage its exhaust flow with respect to the system enclosure. For most ATX systems, it is recommended that the graphics card exhaust heat to the outside of the system enclosure. This type of graphics card thermal solution has the least impact on systems that use typical ATX chassis designs. For other graphics card thermal designs, it is recommended that the graphics card manufacturer and chassis designer or system integrator work closely together to insure the graphics card, chassis, and system components work together so that performance and component reliability are not impacted. IMPLEMENTATION NOTE PCI Express x16 Graphics 150W-ATX Guideline To ensure optimum performance, it is recommended that system and add-in card designers refer to the PCI Express x16 Graphics 150W-ATX Card Thermal and Mechanical Guideline for Desktop Systems. 29

30 30 PCI EXPRESS X16 GRAPHICS 150W-ATX SPECIFICATION, REV. 1.0