X-firing a HD 2600XT w/ HD 2900 Pro

[JoLLyRoGer]

I've got a computer that I built a couple of years ago based on the P35 chipset. In fact it's still in my sig and is still my main PC. The video I used when I built it was a HD2900Pro. It's been a solid card for me and I've never really upgraded it since I've moved most of my gaming activities over to my PS3 these days. However,....yesterday a friend game me an HD2600XT from his older system so I thought it would be fun to try the two in CF and run some benchmarks.

I've never set up crossfire before and this would be a legacy crossfire setup (not CFX). I'm wondering if it's even possible with the mismatched cards, and what will I need to do it? Is there even any benefit or would the 2600XT ultimately hamstring the 2900Pro?

I only have one CF ribbon cable that came with my card and I think I may need two but I'm not positive on this. I've read sporatic informaiton about a software crossfire that does away with the cross-connect cables.

Any help is appreciated.
-JR

 

[cusideabelincoln]

I don't think that's possible according to AMD's chart: http://game.amd.com/us-en/cont...rex/CF_combo_chart.jpg

Even if it was, the 2600XT would indeed severly hamper the 2900 Pro. And you'd only need one CF ribbon.

 

[SlowSpyder]

I don't think that a 2600XT can CF with a 2900, and even if you could I don't see it being faster than a single 2900. A 2900 is more then 2x as fast as the 2600 (I believe) so I see the 2600 only slowing down the 2900. This is all off the top of my head, so someone may prove me wrong, but that's my guess any way.