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AMD Multi Core - Discussion Only

post #1 of 50
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This thread is to bring together the discussions on AMD Multi core CPU's and is where you can discuss the 'How will this Stepping go?' or 'What is the Best Stepping?' or other similar and relevant topics.

Please use this thread only as we have too many separate threads asking the same or similar questions and do not make any further new inidividual threads on such matters as they will be deleted. This will then make it easier for members to search a single thread for similar posts and conversations.

Having said that, Do not use this thread for a real problem you are experiencing, please search the AMD section for any similar conditions that may help you and then open a new thread for your particular issue that still needs to be resolved or worked through.

Some existing threads will be merged into this one and others will be closed off.

Thank you for your co-operation
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post #2 of 50
Well i guess I'll post here first, lol. I, and several other members, have been having weak core issues with our Opteron's ( and X2's I would imagine ). Has any one found a way to strengthen them at all? I think that would be very good information to have in this thread. TIA

edit: Sorry I meant with the dual core Opteron's
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post #3 of 50
Quote:
Originally Posted by pjlietz
Well i guess I'll post here first, lol. I, and several other members, have been having weak core issues with our Opteron's ( and X2's I would imagine ). Has any one found a way to strengthen them at all? I think that would be very good information to have in this thread. TIA
What do you mean by "weak cores?
    
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post #4 of 50
With some of them one core will run slower in super pi or prime95, or even give a rounding error when running prime95.
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post #5 of 50
Quote:
Originally Posted by pjlietz
With some of them one core will run slower in super pi or prime95, or even give a rounding error when running prime95.
Rounding errors would say unstable to me. You do have two seperate processors in that chip, just because one is stable at 2.8GHz doesn't mean the other will be, so you have to check stability on both cores. If it's happening at stock... it could be a bad chip, but more likely it could just be some BIOS/Windows/other software bugs that need to be worked out still. Hard to say. As for the differences in Pi, how much? If it's just a couple miliseconds, it could just be the fact that the second core is sharing the first's memory controller, so you'll have some very small delays in the memory controller.
    
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post #6 of 50
I haven't tried with super pi myself, I just remember reading about that one. As for the prime errors it only seems to happens when running the Large FFT's. One core will crash ( with in an hour on mine ) while the other on goes strong. All other prime tests are fine. Is seems that a few people with the 170 have had that problem, so unless we all have bad chips I don't think thats what it is. Also ncsa had mentioned that there should be a way to strengthen the weak core. I have used Prime95 and SP2004 that ncsa mentioned.

edit: The large FFT's will crash core 1 for me even at stock speeds?
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post #7 of 50
i seem to have the same prob but am waiting to finish my new comp to address it full harditly ( my current rig is giving me to many issues to oc well) but it seemed like my cores were stable, i could run dual prime (usually large ffes and run memtest to mess with the ram) and it would last 6 hrs plus

but when i tried to run dual 32m one of the 32m's would crash allmost immediatly and the other would keep going

thats when i realized that at higher oc's -say like 2.74 for example i couldnt run dual prime without one crashing after say an hour or so but if i ran single sessions of prime either core could handle it for several hours (the most time i have had to test)

the idea of a weaker core is possible but i am (just personal opinion) thinking that it could also have something to do with the possibility of a priority given to one core or more power given to one of them ... but i dont know- once i finish my new rig and get everything switched over ill do some more testing

also heres the info

opty 170
OSA170DAA6CD
CCBWE 0534SPMW
1316069I50169
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post #8 of 50
I tend to think that it may be a programing issue, the way the dual cores proccess data may be just different enough to mess with the highly sensitive benchies in question.
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post #9 of 50
I seem to think that the problem lies somewhere in the memory (and the sharing of it between the two cores)...

My OC'ing stability tests usually go like this, dual Spi 1m, am3, pcm05, dual Spi 32m, and sometimes I'll throw in OCCT for giggles... if the rig passes then its cool.

Getting to my point - one day while running dual Spi 1m @ 2.88 ghz I started core 1 first instead of core 0, like I normally do, and core 0 errored out, when usually its core 1. I rebooted, went 290 x 10, set some slightly tighter mem timings that I knew would error out, and sure enough, when running dual Spi its the secoond instance of the program to be started that errors out every time.

And there I was freaking out thinking I had a bad core or something, and I even reset my waterblock to make sure that I had even spread of thermal paste.

Does anyone have any other observations about core errors with other benching programs?
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post #10 of 50
I think you may be on to something with the shared memory issue as the only time mine fails is when running the dual large fft's ( which is more memory targeted). Thats why i figured I'd run dual small fft's one to each core then the large fft set to run with both cores. And on top of that I ran 100 loops of the gpu tests in 3dmark. I figure if my rig can pass that it is plenty stable for me. Funny though that my fps in 3dmark only went down +/- 5. I did notice that one core was further along in the small fft test then the other, but I think maybe background apps and such are slowing it down as windows is not written for dual core.
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