PowerSpec 5780 VGA Driver
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PowerSpec 5780 VGA Driver
Reserved 0x10 bytes for rid 0x20 type 4 at 0x ata0: Reserved 0x8 bytes for rid 0x10 type 4 PowerSpec 5780 VGA 0x1f0 atapci0: Reserved 0x1 bytes for rid 0x14 type 4 at 0x3f6 ata0: Reserved 0x8 bytes for rid 0x18 type PowerSpec 5780 VGA at 0x atapci0: Reserved 0x1 bytes for rid 0x1c type 4 at 0x ata1: Reserved 0x bytes for rid 0x10 type 3 at 0xe ohci0: SMM does not respond, resetting usb0: Reserved 0x bytes for rid 0x10 type 3 at 0xe ohci1: PowerSpec 5780 VGA does not respond, resetting usb1: Reserved 0x bytes for rid 0x10 type 3 at 0xe ehci0: Reserved 0x bytes for rid 0x10 type 3 at 0xe miibus0: Reserved 0x bytes for rid 0x10 type 3 at 0xe miibus1: KCS mode found at io 0xca2 alignment 0x1 on isa orm0: Number of channels 3 ipmi0: Retrying Command ses0 at PowerSpec 5780 VGA bus 0 target 8 lun 0 ses0: Nvidia and ATI pushed for the increased current because they were getting ready to introduce power hungry video cards.
If memory serves, Nvidia came up with the two additional ground wires. It's not much different from Intel's push for the original atx PowerSpec 5780 VGA.
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The Intel cpu's were running hotter and hotter. Back then the cpu's did not have heatsinks and cases did not have much in the way of fans.
Intel specified the power supply should be located near the cpu because the psu fan could help cool the cpu. When the horizonal desktop pc's PowerSpec 5780 VGA converted to vertical towers the power supplies wound up in the top rear of the cases. There have been a lot of changes since then.
The current movement is heading in the opposite direction. The push for energy efficiency as a way to reduce costs in the corporate arena has resulted in components that use less energy. The movement also resulted in benefits for gamers and enthusiasts.
We now have more efficient power supplies and cpu's and gpu's that use less power. They are not all used for power.
Pin 2 by spec is not connected, although some PSU manufacturers do add a 12V line there. Pin5 is Com for sensing.
Ther aren't 4 12V pins on the 8 pin connector, only 3, and 2 leads are used for sensing the connector type. The other limiting factor of course is the width of the PCB lines on the graphics card, each typically carrying Amps. PowerSpec 5780 VGA would also determine how much power it could carry to the graphics electronics.
Hope that answers most of the questions regarding this unusually engineered connector.