How do I Crossfire 2 HD4890's

[giantpinkbunnyhead]

Hi all,

My 2nd 4890 GPU arrived today and before I attempt to install it, I wanted to clear up some questions.

Each card came with (1) crossfire bridge cable; and each card has (2) crossfire ports on top. So, do I need to use both cables to connect both sets of ports? Or, is just one cable used, and if so... which set of ports?

Next up, regarding connecting power. My PSU has three PCI-E "bundles" with each bundle having two PCI-E connectors each. The 4890's each require two connectors. Does it matter which PCI-E connectors I use with each video card? Should I give each card it's own wire bundle and its associated two PCI-E connectors? Or is it better to have each wire bundle have one connector on each card? Kinda hard to explain but I hope it makes sense.

Thanks in advance.

 

[Keysplayr]

Use both bridge cables.
Use one PCI-e bundle per card.

 

[MegaWorks]

If you have a intel X38/48/58 use both bridge cables that also applies to the AMD 790FX chipset. Now if you're using the P45 chipset use one bridge cables, using both cause the screen to be messed up.

 

[giantpinkbunnyhead]

Thanks for the tips. I do have an X58 so I'll go with both bridge cables and see if that works as it should.