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Amd Phenom 955 BE @ 3.9ghz bottleneck for BF3 crossfire gaming. 2500k/2600k fixed my issues.

post #1 of 157
11/28/11 at 9:00pm
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I have been having low gpu utilization in BF3 in the 35-45% range during crossfire gaming. On top of that, I was getting really bad micro-stutter and other random frame drops. I noticed my oc'd 955 was pegged at almost 100% on all 4 cores the whole time I was playing. Disabling crossfire fixed most of the issues and I was able to have a solid gamin experience at about 40-50 fps with no stutter or bad fps spikes. 1 gpu utilization would show 99%.

I just installed a 2600k today and have it clocked at 4ghz right now. Using Amd 11.10 WHQL drivers with no CAPS I am getting 75-100% utilization on both 5870's, no frame spikes, and no stutter. 6 of my 8 cpu threads on the 2600k run in the 40-50% utilized range.

Do yourself a favour and upgrade your phenoms if you want a solid gaming experience. I have heard on here that the AMD 6-core 1090-1100t's also run xfire well with no problems, but I DO know that the Intel route will fix the bad issues I listed above.


Phenom 955 @3.9ghz: 35-45% gpu

338

338


Phenom 955 @3.9ghz with Xfire disabled. 100% gpu util:

338


INtel 2600k @ 4.0ghz xfire: 75-100% gpu util:

338


338
Edited by evensen007 - 11/30/11 at 7:33am
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post #2 of 157
11/28/11 at 9:06pm
I suggest posting the screen of Task Manager and AB after tabbing out or some people might not believe it.
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post #3 of 157
11/28/11 at 9:26pm
Thread Starter 
I have a second monitor connected that has all my monitoring tools (besides the gpu util % from afterburner that is in the screenshots). How do I capture that second monitor? Also, the phenom is out and will not be going back in, but trust me all 4 cores were pegged at 100. Not sure what's not to believe, but I will screen grab any other info people are interested in.
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post #4 of 157
11/28/11 at 9:28pm
Nothing new but this is a good to reminder that AMD CPUs can not push 2 fast GPUs.
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post #5 of 157
11/28/11 at 9:51pm
Yeah...unless I'm one of the lucky few or something, I have no problems with my 965 and my two 6950's. CPU is never close to 100% and I'm getting near perfect crossfire scaling.
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post #6 of 157
11/28/11 at 10:12pm
I ran BF3 Beta on Ultra just fine with 955BE at 3.9Ghz and CFX 5770s
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post #7 of 157
11/28/11 at 10:20pm
Really sounds like crossfire scaling issues, not the 955 bottle-necking you. If the 955BE was bottle-necking you, would get, say, 35 FPS with CFX 5870s and 33 FPS with one 5870, not more fps with less GPU power.

And of course a 2500k/2600k would fix your problem. They are beasts, and cost a minimum of 2x as much lol, what do you expect...

PS. screenies aren't telling us anything. you could get 2 FPS and the screeny would still look the same as at 174 FPS, as long as V-sync is on.
Edited by Nnimrod - 11/28/11 at 10:22pm
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post #8 of 157
11/28/11 at 10:22pm
I knew that AMD chip was holding you back, now try installing a CAP it should improve your GPU usage. (Should be 99% all the time)

To the doubters: You would have to see the BF3 crossfire fix thread, this man has been through alot.
Edited by Kosai - 11/28/11 at 10:24pm
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post #9 of 157
11/29/11 at 12:47am
Quote:
Originally Posted by Aph0ticShield View Post

I ran BF3 Beta on Ultra just fine with 955BE at 3.9Ghz and CFX 5770s
He's using 5870s.
Quote:
Originally Posted by Nnimrod View Post

Really sounds like crossfire scaling issues, not the 955 bottle-necking you. If the 955BE was bottle-necking you, would get, say, 35 FPS with CFX 5870s and 33 FPS with one 5870, not more fps with less GPU power.
And of course a 2500k/2600k would fix your problem. They are beasts, and cost a minimum of 2x as much lol, what do you expect...
PS. screenies aren't telling us anything. you could get 2 FPS and the screeny would still look the same as at 174 FPS, as long as V-sync is on.
He's talking about GPU usage, not FPS. If he's spending $530 (6950s) or so in video cards why not spend $225 on a CPU that can properly support them.
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post #10 of 157
11/29/11 at 12:59am
This seems like a total crock of sh..... err crap.

In the first two screenies with "poor" 35% GPU utilization, he's sitting at 91FPS. Pretty horrible performance rolleyes.gif

Then he's showing one with CFX disabled, and even that is at 69FPS.

Then showing completely different scenes with the intel, that are mainly of the sky no less rolleyes.gif, which shows 118FPS.

What a horrible comparison.

In order to do a real comparison, you need to be looking at the exact same thing. Once you start putting in variables such as, hey I'm outside where the polygon count is really low as opposed to being in a cave with lots of polygons, well....what do you think is going to happen there? Of course the frames are going to be higher outside.

Regardless, as with most things, I think it's PEBKAC or defective equipment.
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