Hi all! Something quite strange is going on here! Recentely I've installed Prime95 v21 on a PC powered by a PIII 650 Mhz with Win98SE and 128 Mb RAM. It's LL-testing M12582013, so it's using FFT sized 640Kb and, therefore, I should get roughly 190ms per iteration as reported in the Mersenne benchmark web-page. Well, I don't know why but Prime95 says that it takes 305ms each iteration, which is the time needed for 1024Kb FFT with this kind of processor. Moreover I've reached this timing after having disabled all the programs and services usually loaded at system startup but Prime95... I'm sure that the system tray of this Pc has never been so "clean"! Before doing this I was getting 335ms!!
To have some more data I've tryed timing some exp.s using different FFT sizes and it is evident that the performance of this pc aren't at the level it should be: 256K: 110ms, instead of 71 320K: 143ms, instead of 92 384K: 173ms, instead of 111 448K: 207ms, instead of 131 512K: 237ms, instead of 146 640K: 305ms, instead of 190 Well, this means almost 58% slower than expected. Since the data showed by Prime95 are absolutely correct, nothing else to think but there is another cpu type on board... But even this explanation is to be taken witha grain of salt!. The MoBo is a MSI MS 6199VA. When you boot up the system you may read: "PIII CPU at 650E Mhz". What does it mean 650 "E"? Does anybody how to check the Cpu frequency without opening the case? Any suggestion about what's probably going on is welcome!! Thanks in advance to everyboy who will help me. Regards from Italy Guido72 _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
