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7950 crossfire 8x/8x vs 16x/16x performance hit?

post #1 of 13
Thread Starter 
Simple question. I believe my mobo only supports 8x/8x crossfire.
How big a fps hit will this get me vs 16x/16x?
post #2 of 13
YOu only have PCIe 2.0, so 8x would be a small bottleneck for your 7950.
Linus from NCIX did a test with a GTX 580 on x8 PCIe 2.0, and it took a <1% performance hit.
I can't imagine the decrease in FPS from a full 16x being greater than 5%.

The bigger question: Is your i5 up to the task?
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post #3 of 13
Thread Starter 
Quote:
Originally Posted by Legonut View Post

YOu only have PCIe 2.0, so 8x would be a small bottleneck for your 7950.
Linus from NCIX did a test with a GTX 580 on x8 PCIe 2.0, and it took a <1% performance hit.
I can't imagine the decrease in FPS from a full 16x being greater than 5%.

The bigger question: Is your i5 up to the task?

As for my i5.. i realize its outdated. But i really don't have heaps of money right now. And i don't know how much of a performance increase i would see fps wise from just upgrading to an i7 with new mobo. Thats a big chunk of $.

Any suggestions? will i really see a big increase with new cpu vs buying another 7950?
post #4 of 13
0~5% if that.
    
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post #5 of 13
Quote:
Originally Posted by RedFox911 View Post

As for my i5.. i realize its outdated. But i really don't have heaps of money right now. And i don't know how much of a performance increase i would see fps wise from just upgrading to an i7 with new mobo. Thats a big chunk of $.

Any suggestions? will i really see a big increase with new cpu vs buying another 7950?

It all depends on what is your current bottleneck. USe some monitoring programs to look at your usage while gaming. I would upgrade whatever part is above 90% usage.
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by Legonut View Post

It all depends on what is your current bottleneck. USe some monitoring programs to look at your usage while gaming. I would upgrade whatever part is above 90% usage.

alright ill run crysis 3 and see if my i5 runs at 90%
post #7 of 13
the i5 should handle 2 of them fine, Remember this is average use, Yes it will be slightly slower then a 2x00k or 3x00k, But the sandies were only what 10% faster? And a sandy doesn't bottlekneck two 7950s, The pcie hit will be 5-9%, But ultimatly if everything scales 100% then you will see an 80% boost in frames
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post #8 of 13
Thread Starter 
Quote:
Originally Posted by Legonut View Post

It all depends on what is your current bottleneck. USe some monitoring programs to look at your usage while gaming. I would upgrade whatever part is above 90% usage.


I just ran crysis 3 and monitored my gpu and cpu load. Cpu was around 40-50 percent load on average. My gpu however was around 90-99 percent load constantly.
post #9 of 13
Thread Starter 
Quote:
Originally Posted by Rayleyne View Post

the i5 should handle 2 of them fine, Remember this is average use, Yes it will be slightly slower then a 2x00k or 3x00k, But the sandies were only what 10% faster? And a sandy doesn't bottlekneck two 7950s, The pcie hit will be 5-9%, But ultimatly if everything scales 100% then you will see an 80% boost in frames

Thanks for the input. As long as i see a decent increase in frames I'm happy. The nice thing will be, when i upgrade mobo and cpu in future, ill be able to use the 16x/16x. Until then i think i can be satisfied with 8x/8x.
post #10 of 13
Quote:
Originally Posted by RedFox911 View Post

Thanks for the input. As long as i see a decent increase in frames I'm happy. The nice thing will be, when i upgrade mobo and cpu in future, ill be able to use the 16x/16x. Until then i think i can be satisfied with 8x/8x.

You won't get 16x16x unless you go either x79, Or 990FX, Everything else is 8x8x(Intel) or 16x 8x(amd)
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