20200508, 06:12  #1 
Jul 2019
13 Posts 
Why large fft test given so much stress to cpu?
recently I use latest version of mprime 95 to test my mem kits, I found that if I choose large fft(test mem controller and ram), the core temp could went up to 80 degrees, almost the same as I use small fft(L1L3, max temp) to stress cpu only.
so why it would be some much stress given to cpu when I stressing mem? Last fiddled with by jiangv on 20200508 at 06:25 
20200509, 19:42  #2 
∂^{2}ω=0
Sep 2002
República de California
25606_{8} Posts 
Really good FFT implementations will stress both the CPU and the entire memory subsystem.
If your CPU has more than 4 physical cores you may well see less CPU stress for bigFFT since the memory typically can't keep up with the data demands of all the cores, but I'll defer to the owners of such systems to confirm or deny that. 
20200511, 13:07  #3  
Jul 2019
D_{16} Posts 
Quote:


Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Please provide me really large numbers to test manually  bosons  Factoring  29  20191112 13:58 
P95 PrimeNet causes BSOD; small FFTs, large FFTs, and blend test don't  KarateF22  PrimeNet  16  20131028 00:34 
Does a large P1 test eliminate need for ECM tests  UberNumberGeek  Factoring  53  20090711 08:24 
Small prime test divisor efficiency strategy  fenderbender  Math  5  20070718 18:39 
blend / small FFT torture test on linux ?  lukasz  Linux  1  20070109 16:16 