3570k crossfire bottleneck BF3

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Djentleman

Djentleman

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Is there anyway to alleviate this bottleneck?
My cpu usage is at 90+% but my gpu's sit at 60-80%. (these are 7950's stock clock)
I have it overclocked to 4.4GHZ and my temps never go above 80c.
 
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Mousemonkey
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circularpromise53

circularpromise53

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"3570k crossfire bottleneck bf3".. that title sounds like 3570k in crossfire is bottlenecking bf3. Anyway to answer OP's question no, your cpu should not bottleneck crossfire 2 7950's. its arguably the best gaming cpu available

i get at most 60% cpu usage in mp games of bf3 and usually 50% in single player, and the most gpu usage ive seen on my slightly overclocked 7950 is 89%. thats running everything max with a resolution of 1650x1050, with another monitor running. tomorrow i get my third monitor so ill be running eyefinity :). anyway you shouldnt be seeing such high cpu usage, make sure you have no other tasks running in the background.
 
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Djentleman

Djentleman

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I did say in my post that i had 2 7950's. You could of put two and two together.
Anyways.
You have one 7950, not two like me. It requires more cpu power to handle a second one. I'm getting 90+% cpu usage. So that fact that your getting 60 is moot.
 
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circularpromise53

circularpromise53

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it does not require more cpu usage.. that wouldnt really make sense. besides you cpu is better then mine so you should definitely be seeing less or around the same amount of usage. if you have it overclock (stable) then there is something running in the background, or your overclock is not stable. Run prime95 for 3 hours. if there are no errors and your max temp isnt too high then its most likely stable.

"SLI/CFX doesn't require that many more CPU cycles than a single card, you really won't notice a difference in CPU power. A lot of people will say X CPU will bottleneck Y SLI/CFX-setup, but that is only partially true. You will rarely/never get lower framerate in a game that works well with CFX/SLI, but that framerate may feel worse because of microstutter"
 
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circularpromise53

circularpromise53

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wait your running this on a 650 watt psu? thats not enough for crossfire 7950's, add a cpu overclock and i doubt your system is getting enough power.

Radeon HD 7950 Crossfire x2 - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
 
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Djentleman

Djentleman

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It has plenty of power. I used a kilawatt to check how much power it was pulling
 
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Mousemonkey

Mousemonkey

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Where did that quote come from?
 
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Djentleman

Djentleman

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I was talking about bf3 at 1080p being a bottleneck in this thread.
The reason 1080p bottlenecks, is because 7950 crossfire is overkill for it. I notice my frames go up after i add a crap ton of AA to bf3. Because it makes it more graphically demanding and less cpu demanding. Without high resolutions, you become cpu bound.

Either way, your always going to have a bottleneck. Whether it be the GPU or the CPU. There's no way to avoid it.


Quote came from here: http://www.overclock.net/t/1259559/sli-crossfire-what-is-the-cpu-impact
 
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Mousemonkey

Mousemonkey

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That random poster is incorrect as a dual card setup does use more cycles than a single card and SLi uses more than Xfire.
 
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