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Orthos Question

post #1 of 4
Thread Starter 
Hi Folks,

What is the difference in Small FFTs stress test and Stress testing using Gromacs Core?
I ask because I can run Gromacs forever and run all the 3D Marks with no issues, but Small FFTs eventually errors out. It could be 3 minutes or it could be 3 hours.

Thanks
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post #2 of 4
I couldn't tell you the differences in the algorithm but I do know that Gromacs stresses mostly the Math Co-Processor. Small fft stresses the math co-processor, the cache and a bit of the ram. Large fft stresses the RAM a bit more than the CPU relative to small FFT.

Mostly I've heard that Gromacs Core is undesirable for stress testing overclocks. I'd put stock in the errors you're seeing in small fft. You want the cache stressed as well in a stability test.

If you error in any FFT test, you have a problem Houston. I've never heard of a false error being given by a Prime95 based algorithm.
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by mongoose View Post
I couldn't tell you the differences in the algorithm but I do know that Gromacs stresses mostly the Math Co-Processor. Small fft stresses the math co-processor, the cache and a bit of the ram. Large fft stresses the RAM a bit more than the CPU relative to small FFT.

Mostly I've heard that Gromacs Core is undesirable for stress testing overclocks. I'd put stock in the errors you're seeing in small fft. You want the cache stressed as well in a stability test.

If you error in any FFT test, you have a problem Houston. I've never heard of a false error being given by a Prime95 based algorithm.
Alrighty then, Houston we have a problem.
Thanks
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post #4 of 4
On my old overclocked AMD 3700 San Diego, I had the same experience you are having. However I ran an eight hour prime. Most gaming was fine, 3Dmark was fine, everything was except Neverwinter Nights. I'd get a crash during a game save. This time I ran Prime for eight hours without error, then immediately aborted and restarted. Got a small fft error after about 17 minutes. Ramped the voltsd up, no errors and Neverwinter Nights never had that save problem again.

That's why I now verify my overclocks with consecutive Prime or Orthos blend runs.

I'm not surprised you're not encounering much instability but it may be there, especially on CPU intensive apps.
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