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Crossfire 6950 2GB...problem?

post #1 of 6
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At the moment I have one XFX 6950 2GB with unlocked shaders to 1536 and am thinking after christmas when I have a bit more money and when there might be a few deals going on to get one of these:

http://overclockers.co.uk/showproduc...odid=GX-128-MS

Now, I know that not all cards unlocked and the chances are that one that I will get won't. Will there be a problem running the 2 cards together (one unlocked, the other not) as in will it revert to the lower of the 2 or not? Also, does mixing brands/models matter? I'm new to the idea of crossfiring and I think my mobo and PSU can handle it so this is my only concern. Also, will the performance increase be that great as in worth the money? I'm a poor student you see and I want the best bang for my buck.
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Old hand
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post #2 of 6
I'd liek to see the answer to this as well. Currently I am running without the shaders unlocked, but I suppose if I can grab another refference ASUS card from fleabay, that would be good. Shame the coolers suck

Or I might sell mine when I have more money and buy either one GTX570, or two non refference 6950's
post #3 of 6
Mixing Brands makes no difference. You can actually crossfire a HD6950 with either a 6970 or 6990. So no models do not make a difference. And again non-reference cards make no difference. If you CF a 6950 unlocked with a stock 6950 it will perform largely the same as a 6950 CF. TBH if you get one that does not unlick just flash your one back to 6950 and OC the **** out of the two of them and you will get 6970 performance.
Edited by Ro9 - 10/10/11 at 12:18pm
Bertie Beast
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Bertie Beast
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post #4 of 6
This will work. You can crossfire a 6970 and a 6950. You can also mix brands in crossfire. I always thought that the faster card would down clock to the slower card but lately I have been hearing that both cards will run at their respective clock speeds. Someone else may want to confirm this. Even if the 6950 you get does not unlock, you should be able to overclock it to at least close to the 6970 speeds. Running two cards at different clock speeds will probably cause more micro-stutter. Your power supply will be plenty.

Edit: I think the performance is worth the money. The 6xxx series scale really well in crossfire.
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Ivy-E
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post #5 of 6
All good news then
post #6 of 6
Op there wont be any problem. In fact I am running a similar setup where my primary card is a powercolor reference board & its flashed to a full HD 6970 and my secondary card is a sapphire HD 6950 Dirt 3 which dint unlock. So far I have had no issues except once or twice BSOD due to ati drivers while OCing. Both the cards have been running at 880, 1375 atm and in the benches my setup is like 4-5% slower than a true HD 6970 CF
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