6-pin SSI EEB WS and 6-pin PCIe Power Incompatible!
I was just reading a Tyan manual addendeum for the S2895 (Tunder K8WE) and noticed the 6-pin (2x3) SSI EEB v3.51 Workstation power connector and 6-pin (2x3) PCI-Express x16 150W power connector are INCOMPATIBLE! Not only that, but if you use the wrong one, it's very probably you will DAMAGE your board!
There are no differentiating keys, they are EXACT SAME fitting, right down to the square and round holes. Who was the genius that came up with this?!?!?! The SSI EEB WS connector provides +3.3V on pins 1-2, +12V on pins 3-4, and GND on pins 5-6. The new PCI-Express connector provides +12V on pins 1-3, GND on pins 4 and 6 and a "sense" pin 5.
This clearly falls on the PCI-Express and video manufacturers, because the SSI EEB spec PREDATES the PCI-Express spec by YEARS. So be sure to check our power supply manual with your mainboard/video card BEFORE you connect. Yellow is typically used for +12V, but that's NO GUARANTEE.
- More about the SSI Specification
The Server System Infrastructure (SSI) specification is a set of standards devised for servers, workstations and other components you typically don't find in desktops. Although a lot of desktops to adopt SSI standards later on, many do it in a not-so-compatible, not-so-standard way. Why the desktop/consumer industry can't "get their act together" and follow the SSI standards, I'll never know -- especially since the SSI specs already exist well before the desktops need them.
The SSI Entry-Level Power Supply (EPS) (common rev 2.1) is probably best known. EPS12V power supplies quickly became commonplace after both Athlon MP and [P4-based] Xeon dual processor mainboards required more power than the ATX power supplies could provide. Proprietary power supplies were commonly used prior to the SSI EPS specification, but with the commodization of workstation and server mainboards by AMD, ServerWorks, etc..., the SSI EPS was quickly born as ATX was incapable.
The SSI Entry-Level Eletronics Bay (EEB) (common rev 3.51) is lesser known, but it is far more important. It governs the all-encompassing mechanical and electrical specifications of mainboard, expansion, electrical, power, thermal, etc... Probably the best known are the typical SSI EEB form-factor (commonly mis-represented as Extended ATX, 12"x13"), the 8-pin (4x2) "Server" (SVR) power connector (single or dual-rail +12V) and 6-pin (3x2) "Workstation" (WS) power connector (+3.3V and +12V) that is required to supply AGP Pro slots.
Delivering extra power to AGP video cards was provided by the AGP Pro slot, driven by the SSI EEB WS power connector. Why the PCI-Express (PCIe) standards group did not follow the established +3.3V/+12V design is beyond me, it just doesn't make sense -- especially when the connectors are exact, right down to the connector's individual pin shapes.
There are no differentiating keys, they are EXACT SAME fitting, right down to the square and round holes. Who was the genius that came up with this?!?!?! The SSI EEB WS connector provides +3.3V on pins 1-2, +12V on pins 3-4, and GND on pins 5-6. The new PCI-Express connector provides +12V on pins 1-3, GND on pins 4 and 6 and a "sense" pin 5.
This clearly falls on the PCI-Express and video manufacturers, because the SSI EEB spec PREDATES the PCI-Express spec by YEARS. So be sure to check our power supply manual with your mainboard/video card BEFORE you connect. Yellow is typically used for +12V, but that's NO GUARANTEE.
- More about the SSI Specification
The Server System Infrastructure (SSI) specification is a set of standards devised for servers, workstations and other components you typically don't find in desktops. Although a lot of desktops to adopt SSI standards later on, many do it in a not-so-compatible, not-so-standard way. Why the desktop/consumer industry can't "get their act together" and follow the SSI standards, I'll never know -- especially since the SSI specs already exist well before the desktops need them.
The SSI Entry-Level Power Supply (EPS) (common rev 2.1) is probably best known. EPS12V power supplies quickly became commonplace after both Athlon MP and [P4-based] Xeon dual processor mainboards required more power than the ATX power supplies could provide. Proprietary power supplies were commonly used prior to the SSI EPS specification, but with the commodization of workstation and server mainboards by AMD, ServerWorks, etc..., the SSI EPS was quickly born as ATX was incapable.
The SSI Entry-Level Eletronics Bay (EEB) (common rev 3.51) is lesser known, but it is far more important. It governs the all-encompassing mechanical and electrical specifications of mainboard, expansion, electrical, power, thermal, etc... Probably the best known are the typical SSI EEB form-factor (commonly mis-represented as Extended ATX, 12"x13"), the 8-pin (4x2) "Server" (SVR) power connector (single or dual-rail +12V) and 6-pin (3x2) "Workstation" (WS) power connector (+3.3V and +12V) that is required to supply AGP Pro slots.
Delivering extra power to AGP video cards was provided by the AGP Pro slot, driven by the SSI EEB WS power connector. Why the PCI-Express (PCIe) standards group did not follow the established +3.3V/+12V design is beyond me, it just doesn't make sense -- especially when the connectors are exact, right down to the connector's individual pin shapes.
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