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Trouble Connecting PSU to Graphics Card

Last response: in Graphics & Displays
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June 10, 2012 2:43:23 AM

Hey Guys,

I'm having a hard time understanding how to connect my HD 6950 graphics card to my OCZ 650W power supply. The graphics card inputs power through two 6-pin PCIe power connectors. The power supply has several 5-pin "Peripheral IDE/SATA" power ports, and it has two 8-pin "PCI-E" power ports.

Based on the cables that I have, I see 3 options: (1) Should I use both of the PCI-E ports on the PSU to connect to the graphics card's power input? (2) Should I split one of the 5-pin Peripheral power ports on the PSU into two 6-pin PCIe power connectors to connect to the graphics card? (3) Should I use two of the 5-pin Peripheral power ports to power the graphics card (each port would connect to a single 6-pin PCIe port on the graphics card)?
a b U Graphics card
June 10, 2012 3:12:13 AM

use both of the PCI-E ports on the PSU to connect to the graphics card's power input
a b U Graphics card
June 10, 2012 3:34:28 AM

The 2, 8 pin pci express connectors should come apart to make two, 6+2pin connectors
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a c 107 U Graphics card
June 10, 2012 3:40:45 AM

the specs say you have 1 6 pin and a 6+2 pin. turn the 6+2 pin into a 6 pin and plug both in
June 10, 2012 3:43:23 AM

If I use both PCI-E ports on the PSU to power the graphics card, would that eliminate the possibility of doing Crossfire with another graphics card in the future (since I wouldn't have any power ports left)?

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a c 107 U Graphics card
June 10, 2012 3:52:37 AM
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sirius683 said:
If I use both PCI-E ports on the PSU to power the graphics card, would that eliminate the possibility of doing Crossfire with another graphics card in the future (since I wouldn't have any power ports left)?


yes, it would. the 6950 in crossfire would have probably needed a 700w+ supply just for 4 6+2 pin cables. 650w area are built with only 2 6 pins, which are for crossfiring mid range cards of its generation.
June 10, 2012 4:15:15 AM

Okay, thanks for the explanation.

Do the Peripheral power ports on the PSU provide too little power for a connection to the graphics card? i.e. Is this why I have to connect the graphics card to the PCI-E port?
a c 107 U Graphics card
June 10, 2012 4:17:18 AM

the gpu requires the largest amount of power in a build. the mobo connector would not supply enough power for extremely high end cards. the highest card that doesn't require a 6 pin connector is a 7750
June 10, 2012 3:39:38 PM

Best answer selected by sirius683.
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