Quick CrossFire question

[mcmurphy12]

I just have a quick question about Crossfiring. And before you ask, yes I have Googled this, but the results I came up with were conflicting and unclear. I just want a straightforward answer. I have a HIS IceQ HD 6950 with 1 GB of memory in my computer right now. I want to know if I can crossfire with a different brand and a card with 2 GB of memory. From my understanding, this will work, but again, I just want to be sure before I spend the money.

 

[slh28]

No it won't work because of the difference in memory. A different brand 1GB 6950 is ok though.

 

[hellokitty[hk]]

I believe you can but it would be a waste to do so. You might as well just buy another 1GB card.

 

[red1776]

You can crossfire a 1GB card with a 2GB card. you can mix brands of cards as well. as long as the cards are of the same line you can CF them. For example you can CF a 6950 with a 6990 or a 6970.
here is a CF compatibility chart.

 

[slh28]

Actually my bad, it seems the 6950 1GB just uses half density memory modules, the 1GB and 2GB versions have the same memory bus widths and architechture so it should work.

However you would only effectively be getting 1GB VRAM (not 3GB or 2GB), so the 2GB version offers no additional benefit for the higher price.

 

[LNCPapa]

I used to run crossfired a 2GB 5970 (which is essentially 2 * 1GB 5850) and a 2GB Eyefinity 6 5870 of a different brand [Three way crossfire consisting of 1GB 5850 + 1GB 5850 + 2GB 5870]. It worked until I just decided to get another 5970 instead - though that too was a different brand.