Mersenne Digest Monday, December 29 2003 Volume 01 : Number 1100
---------------------------------------------------------------------- Date: Fri, 26 Dec 2003 02:36:25 +0100 From: "Jeroen" <[EMAIL PROTECTED]> Subject: Mersenne: Single or Dual channel memory for P4 Currently I'm doing 0.078 sec/iteration with my P4-2400 (800FSB) I have one single 512 MB PC3200 DDR memory module in my system. How much speed increase will I see if I install another memory module so that my memory runs in dual channel? I've looked on the benchmark pages on mersenne.org but all I could find was just P4-2400, no single or dual channel. _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 26 Dec 2003 19:33:18 +0000 From: "Brian J. Beesley" <[EMAIL PROTECTED]> Subject: Re: Mersenne: Single or Dual channel memory for P4 On Friday 26 December 2003 01:36, Jeroen wrote: > Currently I'm doing 0.078 sec/iteration with my P4-2400 (800FSB) > I have one single 512 MB PC3200 DDR memory module in my system. > How much speed increase will I see if I install another memory module so > that my memory runs in dual channel? I've looked on the benchmark pages on > mersenne.org but all I could find was just P4-2400, no single or dual > channel. If you plan to install dual channel memory please check that the modules are _identical_ in timings as well as in size & speed. Otherwise your system will either not give best performance or may be unstable. I have no experience with dual channel PC3200 DDR but my P4-2666 system running dual channel PC2100 DDR is significantly quicker than my P4-2533 system running 1066 MHz RDRAM. On the basis that 1066 MHz RDRAM is noticeably quicker than 400 MHz single channel DDR (PC3200) I'd expect that going dual channel would give a very significant improvement in speed _for mprime/prime95_ probably around 25%. Whether this would reflect in "standard benchmarks" using graphics, games etc. is a mystery to me. mprime/prime95 hit the memory bus _very_ hard & anything you can do to ramp up the CPU/memory bandwidth is definitely not going to hurt! Regards Brian Beesley _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 26 Dec 2003 19:35:24 +0000 From: "Brian J. Beesley" <[EMAIL PROTECTED]> Subject: Re: Mersenne: Where is M23494381? On Thursday 25 December 2003 23:22, Ignacio Larrosa Caņestro wrote: > Where went M23494381? > > I has assigned that exponent to factor. But today it dissappears from my > Individual Account Report. And I don't found it in the Assigned Exponents > Report nor in the Cleared Exponents Report ... Yes - one of my system "lost" an assignment a couple of days ago - or at least it did an automatic checkin & the elapsed time dropped to zero. I'd just let it carry on running. Regards Brian Beesley _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 26 Dec 2003 19:33:18 +0000 From: "Brian J. Beesley" <[EMAIL PROTECTED]> Subject: Re: Mersenne: Single or Dual channel memory for P4 On Friday 26 December 2003 01:36, Jeroen wrote: > Currently I'm doing 0.078 sec/iteration with my P4-2400 (800FSB) > I have one single 512 MB PC3200 DDR memory module in my system. > How much speed increase will I see if I install another memory module so > that my memory runs in dual channel? I've looked on the benchmark pages on > mersenne.org but all I could find was just P4-2400, no single or dual > channel. If you plan to install dual channel memory please check that the modules are _identical_ in timings as well as in size & speed. Otherwise your system will either not give best performance or may be unstable. I have no experience with dual channel PC3200 DDR but my P4-2666 system running dual channel PC2100 DDR is significantly quicker than my P4-2533 system running 1066 MHz RDRAM. On the basis that 1066 MHz RDRAM is noticeably quicker than 400 MHz single channel DDR (PC3200) I'd expect that going dual channel would give a very significant improvement in speed _for mprime/prime95_ probably around 25%. Whether this would reflect in "standard benchmarks" using graphics, games etc. is a mystery to me. mprime/prime95 hit the memory bus _very_ hard & anything you can do to ramp up the CPU/memory bandwidth is definitely not going to hurt! Regards Brian Beesley _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 26 Dec 2003 19:35:24 +0000 From: "Brian J. Beesley" <[EMAIL PROTECTED]> Subject: Re: Mersenne: Where is M23494381? On Thursday 25 December 2003 23:22, Ignacio Larrosa Caņestro wrote: > Where went M23494381? > > I has assigned that exponent to factor. But today it dissappears from my > Individual Account Report. And I don't found it in the Assigned Exponents > Report nor in the Cleared Exponents Report ... Yes - one of my system "lost" an assignment a couple of days ago - or at least it did an automatic checkin & the elapsed time dropped to zero. I'd just let it carry on running. Regards Brian Beesley _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 26 Dec 2003 12:46:57 -0800 From: "Lowen B. Holde" <[EMAIL PROTECTED]> Subject: Mersenne: Date: Fri, 26 Dec 2003 15:46:49 -0500 Hi, I have just built a system with the following components / operating system: Abit NF7-S v. 2.0 motherboard Athlon XP 2500+ Barton CPU Zalman CNPS7000A-CU cooler w/Arctic Silver 5 2 x 512mb Buffalo PC3200 w/Winbond CH-5 Radeon 9700 np Fortron 530W PSU Windows XP sp1 I am running the torture test on "blend" to test stability. However, using my default bios settings (default speeds, voltages, memory timings, etc.), Prime95 fails with a "Sorry, this program has to close, do you want to notify Microsoft?" error. If I drill down to the actual error screen, I see a Windows Exception error. I never see any message in the Prime95 window itself about an error or a wrong calculation. My question: is the Windows error I described a symptom of faulty hardware, or is this more likely a software problem? Perhaps I need to reload Windows? I have tried 236, 237 and 238, all with the same results. My system temperatures never exceed 39 C for CPU and 21 C for the motherboard. The failure can occur anywhere between 1 minute and 3 1/2 hours of running the test. Any help is appreciated. _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 26 Dec 2003 16:23:16 -0500 From: George Woltman <[EMAIL PROTECTED]> Subject: Re: Mersenne: Single or Dual channel memory for P4 At 07:33 PM 12/26/2003 +0000, Brian J. Beesley wrote: >I'd expect that going dual >channel would give a very significant improvement in speed _for >mprime/prime95_ probably around 25%. Ask for advice at www.mersenneforum.org. I think I've read that dual channel gives you around a 5% boost. _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Mon, 29 Dec 2003 10:48:49 -0000 From: "Doug Feather" <[EMAIL PROTECTED]> Subject: Mersenne: Re: Where is M23494381? > I has assigned that exponent to factor. But today it disappears from my Individual Account Report. I've had the same experience with some exponents assigned to me. My guess is that someone has been doing trial factoring work semi-independent of PrimeNet and has just reported all the work that they have done. My reasons for this belief is 2 fold. 1. For a long time on this page: http://mersenne.org/primenet/ there where no exponents in the range listed 21.9M to 22.0M. This has recently changed with them now all being listed as available for first time Lucas Lemer testing. 2. I had a couple of exponents booked out on one machine, these too disappeared recently but that machine has since checked in to give new end dates. They now appear there again but there are 2 differences. The booking out date has changed to the check-in date and the range the number had already been factored to has increased. He is the listing as it was just before it disappeared and how it appears now: 23492377 F 57 108.0 84.4 64.4 14-Nov-03 19:56 07-Sep-03 11:52 Dad 1800 v19/v20 23492377 F 58 1.2 134.8 102.8 27-Dec-03 13:59 Dad 1799 v19/v20 - - Range already factored to has increased from 57 to 58. - - Days assigned to me reduced from 108.0 to 1.2 - - Date assigned to me changed from 7/9/03 to 27/12/03 (or in US date format 9/7/03 to 12/27/03) Doug. _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ End of Mersenne Digest V1 #1100 *******************************
