Do you have to plug in both PCIe cables into the graphics card?

[wanderer]

Or is that not enough to power it properly? I recently got another 6950 so that I could use it in crossfire, but the cables that it came with won't work with my PSU.

Right now I have 2 6 pin cables plugged into my old 6950. I'm just wondering if I could take one out and use it on the new card, or if I'll need to buy another dual 6 pin cable.

 

[rolli59]

You need to have both of them connected on both cards. What PSU are you using? If it is big enough then using adapters to 4 pin molex should work.

 

[wanderer]

I thought so. The problem is that the only molex plug on my PSU is already being used by something else. It only has 8 pin and 6 pin PCIe open

PSU is an Antec CP-850

 

[zhongyan]

That psu should have 2 Pci-e 6pin connectors and 2 Pci-e 6+2pin connectors, that should be enough for Radeon 6950's in Crossfire
So you would have 4 Pci-e connectors, 2 for each card