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Will a Crossfired 6850s be bottlenecked?

post #1 of 14
Thread Starter 
I'm planning on playing over 1920x1080, and about to buy a VGA card, I want to go for 2x6850s because I'm not going to upgrade it anytime soon and I guess they'll live for quite sometime.

So my question, will a Phenom II x4 CPU on 3.4-3.8Ghz bottleneck these?

EDIT:
Forgot to say, my mobos' PCI-e slots operate at 16x/4x
Edited by WildEast - 4/8/11 at 8:31am
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post #2 of 14
nah you should be fine
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post #3 of 14
yeah I bet someone is going to pop out a benchmark or something showing that there will be a bottle neck.

Gpu's will probably be only running at 85% while your cpu is 100%

I may be wrong but I have read that a lot of the higher end cards in crossfire will be bottlenecked by the phenom II
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post #4 of 14
there was someone else like 2 weeks ago where he had 2 6950's being bottle necked by his 1055t. If your only playing at 1920x1080 there is really no need for 2 6950's, one will be suffice.

unless in your original post you saying your playing over 1920x1080 you mean by in a larger resolution than 1920x1080 (eyefinity setup)
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post #5 of 14
Thread Starter 
Quote:
Originally Posted by Hogwasher View Post
yeah I bet someone is going to pop out a benchmark or something showing that there will be a bottle neck.

Gpu's will probably be only running at 85% while your cpu is 100%

I may be wrong but I have read that a lot of the higher end cards in crossfire will be bottlenecked by the phenom II
But I don't think a 6850 is meant for being High End, also, I guess a 85% of the dual 6850 is not bad at all since these scale around 90-95% in most games , that is about +80% performance over a single 6850. Anyone for bottleneck benchmarks?
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post #6 of 14
nah the 6850 is nothing really, two of them will be no problem.
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post #7 of 14
Quote:
Originally Posted by WildEast View Post
But I don't think a 6850 is meant for being High End, also, I guess a 85% of the dual 6850 is not bad at all since these scale around 90-95% in most games , that is about +80% performance over a single 6850. Anyone for bottleneck benchmarks?
i think that scaling is within eyefinity resolutions where most crossfire rigs see the best scaling.
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post #8 of 14
The card(hd6850) which will run on x4 slot will be bottlencked,
so I suggest u to go with a single hd6950 & unlock it to a hd6970,make sure u get the 2gb version because u cant unlock 1gb version of hd6950
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post #9 of 14
Thread Starter 
Quote:
Originally Posted by Aniket View Post
The card(hd6850) which will run on x4 slot will be bottlencked,
so I suggest u to go with a single hd6950 & unlock it to a hd6970,make sure u get the 2gb version because u cant unlock 1gb version of hd6950
I'm not really looking into price now more than performance (Can't afford more than a 6970 now tho), I'm pretty sure a 2x6850s can perform much better than a 6970, but will the x4 PCI-e/Phenom bottleneck make a 6970 better?
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post #10 of 14
Quote:
Originally Posted by WildEast View Post
I'm not really looking into price now more than performance (Can't afford more than a 6970 now tho), I'm pretty sure a 2x6850s can perform much better than a 6970, but will the x4 PCI-e/Phenom bottleneck make a 6970 better?
your OC'd phenom wont bottleneck but the x4 pci ex slot on your mobo will surely bottleneck any gpu,
note: when a gpu runs at 8x it doesnt bottleneck but when it runs in 4x it surely bottlenecks,
hope this helps
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Cyrus
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