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Will My CPU be a Bottleneck for CrossfireX?

post #1 of 32
Thread Starter 
I recently sold my XFX HD 6950 2GB reference model and bought two Sapphire HD 6950 2GB Flex cards to Crossfire. However, will my CPU bottleneck the Crossfire performance? If so, could I overclock my CPU to eliminate this, and if so; how do I do that safely? I don't have the money now to replace my CPU, motherboard, etc.

Thanks!
Edited by Brandonn2010 - 7/28/11 at 1:57pm
post #2 of 32
You're definitely going to need to overclock your 925 if it's only at 2.8 GHz.
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post #3 of 32
Why did you sell and re-buy the same card?

But yea you will get some bottleneck. The Phenom II's are fairly slow, especially one at 2.8 GHz. I'm not sure how big the bottleneck will be but I don't think it'll be that big.
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post #4 of 32
even at 4.0+ its going to bottleneck.

My 570's were bottlenecked at 4.2 on my 955...
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post #5 of 32
Thread Starter 
I sold the card and bought two others because I wanted two identical cards to Crossfire, and I couldn't find my card anywhere.
post #6 of 32
You might get some games that push both cards to 100%, but in most games I'd say your cpu will be holding your cfx setup back.

Also, you don't need identical cards to crossfire - I have 3 different 6970s
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post #7 of 32
Overclock it to 4ghz and you will be fine. Will there be a bottleneck? Yes but then again there is ALWAYS a bottleneck in every system because there is always a weakest link. The question is by how much will it effect your performance. IMO not too much. Yes if you get a 2600K @4.9ghz you will get better frame rates but you shouldn't have any trouble running games at 4.0ghz.
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post #8 of 32
Thread Starter 
So how would I (safely) overclock my CPU to 4GHZ? And what temperature monitor is the most accurate for the CPU?
post #9 of 32
Quote:
Originally Posted by Brandonn2010 View Post
I sold the card and bought two others because I wanted two identical cards to Crossfire, and I couldn't find my card anywhere.
that was a smart move
i like it honestly better if two cards or even more match in a pc, which im sure you wanted to achieve by selling your old one.

its going to bottleneck for sure, but until you want to upgrade/ push that cpu higher, maybe even go bulldozer in the long haul, i think you should be fine, wont be maxing those cards, but you wont be disappointed with your upgrade.

Quote:
Originally Posted by fluxlite View Post
Also, you don't need identical cards to crossfire - I have 3 different 6970s
im sure he was aware of that, but wanted matching components, which is more then understandable if your only running one rig, that stuff should look its nicest. im running two non matching 5770s in my rig right now, and its bothering me, not performance wise but eye candy wise.
Edited by hitman1985 - 7/28/11 at 2:07pm
post #10 of 32
Quote:
Originally Posted by Brandonn2010 View Post
So how would I (safely) overclock my CPU to 4GHZ? And what temperature monitor is the most accurate for the CPU?
Read first, make sure you have adequate cooling and see how far you can push it There really isn't a most accurate temperature monitor because they all read off of the same temperature diodes. HWMonitor is what I use but there are many others like Real Temp, etc.

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