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Intel i5 3570K bottlenecking 7970 in crossfire?

post #1 of 61
Thread Starter 
Hello,

I recently bought one additional 7970 to run in crossfire, but the experience in BF3 multiplayer was not so good. My processor is overclocked to 4GHz now, and I cant OC more until I get my water cooling. On all ultra I have between 60-100 fps, but mostly around 70 fps. If I use only one card I get the same fps (around 80 fps average). There is hardly any difference between running one card or two. If I check the MSI Afterburner, I have about 55-60% GPU usage on both cards. I have about 70-80% CPU usage while gaming. When alot of things happening in the game in multiplayer fps drops to about 55 and it feels laggy. Both cards are running at 1050/1400. It is about 10-15 fps difference between low and everything on ultra in crossfire, which is weird.

If I run single player, I get around 150-200 fps and gpu usage is around 70-80%. I tested the Heaven benchmark and the gpu usage is 95-99% for both the cards. If I run BF3 with only one card, I get 99% GPU usage.

My spec:
i5 3570k @ 4GHz
MSI z77a GD65 (latest bios)
16 gb frame
1000w PSU (fractal design)
Catalyst 2.13 beta 6 drivers.

As I understand it, it's my cpu that limits the gpu usage in crossfire and gives me low fps. Do you think this problem will be fixed when I go back to my normal clock, that is 4.8Ghz? Im not planning to run all ultra, but with my custom settings, I get 70-120 fps with one card, and I hope to get at least 120 fps with two 7970s. I play at 1080p and have vsync off.

What do you think about this issue?

/Az
Edited by PachAz - 3/4/13 at 11:20am
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post #2 of 61
More cpu clock will make it a non-issue however bf3 will put HT to great use if you had it.
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post #3 of 61
Quote:
Originally Posted by tsm106 View Post

More cpu clock will make it a non-issue however bf3 will put HT to great use if you had it.

HT isn't as useless as it used to be for games... Crysis 3 itself shows quite a boost from HT to the point where it's noticeably over non-HT cpus.
     
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post #4 of 61
Simply overclocking an extra 300mhz isn't much of deal. Reach to 4.5 if you're comfortable with that. Easy solution
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post #5 of 61
Thread Starter 
Hello,

Thanks for your advice, I really hope my cpu bottleneck the gpus, because then I can overclock-rid the problems. If not, I dont know what to do. BF3 is the only game I have tested.
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post #6 of 61
4.5 ghz overclock will a good boost in fps. I have gtx 670 sli and i5 3570k clocked at 4.5 ghz.
I am trying to get to 5ghz zone because i still want more fps and gpu usage. If you can hit 5ghz can you tell me the difference from 4.5.
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post #7 of 61
one question, why do you play with V-sync off? what a waste of energy
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post #8 of 61
Quote:
Originally Posted by quark004 View Post

4.5 ghz overclock will a good boost in fps. I have gtx 670 sli and i5 3570k clocked at 4.5 ghz.
I am trying to get to 5ghz zone because i still want more fps and gpu usage. If you can hit 5ghz can you tell me the difference from 4.5.

not a huge differance in 4.5 and 5.0 in terms of gaming ive had both. in fact the sweet spot i found was 4.6 ghz atleast for my 2500k that is
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post #9 of 61
Quote:
Originally Posted by PachAz View Post

Hello,

I recently bought one additional 7970 to run in crossfire, but the experience in BF3 multiplayer was not so good. My processor is overclocked to 4GHz now, and I cant OC more until I get my water cooling. On all ultra I have between 60-100 fps, but mostly around 70 fps. If I use only one card I get the same fps (around 80 fps average). There is hardly any difference between running one card or two. If I check the MSI Afterburner, I have about 55-60% GPU usage on both cards. I have about 70-80% CPU usage while gaming. When alot of things happening in the game in multiplayer fps drops to about 55 and it feels laggy. Both cards are running at 1050/1400. It is about 10-15 fps difference between low and everything on ultra in crossfire, which is weird.

If I run single player, I get around 150-200 fps and gpu usage is around 70-80%. I tested the Heaven benchmark and the gpu usage is 95-99% for both the cards. If I run BF3 with only one card, I get 99% GPU usage.

My spec:
i5 3570k @ 4GHz
MSI z77a GD65 (latest bios)
16 gb frame
1000w PSU (fractal design)
Catalyst 2.13 beta 6 drivers.

As I understand it, it's my cpu that limits the gpu usage in crossfire and gives me low fps. Do you think this problem will be fixed when I go back to my normal clock, that is 4.8Ghz? Im not planning to run all ultra, but with my custom settings, I get 70-120 fps with one card, and I hope to get at least 120 fps with two 7970s. I play at 1080p and have vsync off.

What do you think about this issue?

/Az

what cooling are you running i was able to obtain a stable 4.5 ghz overclock on a 2500k with on a h50 cooler and i can do much higher with my custom loop
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post #10 of 61
Yes in BF3 depending on the MAP the CPU will hold you back.
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