I let the machine cool and ran a benchmark, then I ran another benchmark directly after the processor had been working hot for a while, then I ran another benchmark while the processor was hot and prime95.exe was set to Win2k's Real Time priority. The results:
> Best time for 256K FFT length: 16.467 ms. > Best time for 320K FFT length: 21.976 ms. > Best time for 384K FFT length: 26.791 ms. > Best time for 448K FFT length: 32.243 ms. > Best time for 512K FFT length: 35.361 ms. > Best time for 640K FFT length: 47.979 ms. > Best time for 768K FFT length: 58.182 ms. > Best time for 892K FFT length: 71.367 ms. > Best time for 1024K FFT length: 78.093 ms. > Best time for 1280K FFT length: 111.840 ms. > Best time for 1536K FFT length: 141.851 ms. > Best time for 1792K FFT length: 181.142 ms. > Best time for 256K FFT length: 16.427 ms. > Best time for 320K FFT length: 22.041 ms. > Best time for 384K FFT length: 26.730 ms. > Best time for 448K FFT length: 32.180 ms. > Best time for 512K FFT length: 35.208 ms. > Best time for 640K FFT length: 47.758 ms. > Best time for 768K FFT length: 57.267 ms. > Best time for 892K FFT length: 71.628 ms. > Best time for 1024K FFT length: 76.722 ms. > Best time for 1280K FFT length: 112.063 ms. > Best time for 1536K FFT length: 140.377 ms. > Best time for 1792K FFT length: 182.122 ms. (it should be noted the results immediately above may be slightly inflated due to the presense of temperature monitoring software) > Best time for 256K FFT length: 16.438 ms. > Best time for 320K FFT length: 21.964 ms. > Best time for 384K FFT length: 26.779 ms. > Best time for 448K FFT length: 32.179 ms. > Best time for 512K FFT length: 35.288 ms. > Best time for 640K FFT length: 47.877 ms. > Best time for 768K FFT length: 56.832 ms. > Best time for 892K FFT length: 71.646 ms. > Best time for 1024K FFT length: 76.920 ms. > Best time for 1280K FFT length: 111.058 ms. > Best time for 1536K FFT length: 140.468 ms. > Best time for 1792K FFT length: 180.737 ms. > I also ran my current LL test (2^33XXXXXX-1) with Prime95 at real time priority and screen output on every iteration. I found that when nothing else was being touched, it went 0.180 sec/iter, with an occasional (every few seconds) blip to 0.179 or 0.181. The best I saw was 0.178. Comparing these to the benchmarks on mersenne.org suggests something is causing a loss of CPU power. I still suspect the thermal monitor feature because it is possible the CPU could heat so fast that it kicks in instantly. (or possibly the TM never turned off even after the cool down). Its kind of strange how Intel's website tells you that you should make sure that Thermal Monitor is never activated under normal conditions, but doesn't seem to plainly state how to determine if it is. Regards, David Meyer ([EMAIL PROTECTED]) By the way, I thought I should mention I'm going to MIT next year as a freshman. I'm planning to study mathematics and computer science. Any inside advice? :) George Woltman wrote: > At 06:55 PM 12/22/2001 -0500, Paradox wrote: > >> I get approximately 0.180 seconds/iteration. According to the >> benchmark on mersenne.org, I should be getting closer >> to 0.143 seconds/iteration. > > > Try stopping prime95 and let the CPU cool. Then run Advanced / Benchmark. > Hopefully you will get timings before the CPU heats up and thermal > throttling > kicks in. If your timings match the benchmark page, then your machine is > capable of achieving the timings others are seeing. > > If that is the case, then there are two possibilities. The timing you > see running > an LL test is an "average" time vs. the benchmark which shows "best" time. > Either some OS setting or installed software is causing cycles to be > wasted, > or thermal throttling is kicking in. I do not know how to isolate the > problem. > > As an aside, you would be the first to report thermal throttling so > maybe your > heatsink isn't installed properly or a case fan is dead or some cables are > interfering with the airflow. > > > _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
