Re: Mersenne: Benchmark Timings: XP1800+
At 08:58 PM 8/18/02 +, you wrote: One of these days I'll drop some DDR in there (sad to say, I don't have any spare right now), and see if it truly does drop down to 0.091 or thereabouts. Note that it is not often possible to use SDRAM or DDRAM in the same board. SDRAM DIMMs are 168 pin, DDRAM DIMMs are 184 pin, so the modules are not physically interchangeable. Unless you have two sets of RAM slots, you aren't going to be able to convert without swapping the mobo. Fortunately, at least I chose the MB well. I do indeed have both SDRAM and DDRAM slots (two of each), and I was aware of the inability to run both concurrently. Thanks! _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Benchmark Timings: XP1800+
There are some SIS based motherboards like the hugely popular ECS K7S5A(among DC farmers) That have both DDR and SDR ram slots. I personally have more than 15 of them running a whole spread of SDR durons, DDR Thoroughbreds(latest AXP processors)and everything in between. Note that it is not often possible to use SDRAM or DDRAM in the same board. SDRAM DIMMs are 168 pin, DDRAM DIMMs are 184 pin, so the modules are not physically interchangeable. Unless you have two sets of RAM slots, you aren't going to be able to convert without swapping the mobo. Even then I doubt you will be able to use both DDR and SDR at the same time, without crippling the DDR performance to SDR levels. It is not possible to use DDR and SDR simultaniously. Neither VIA or SIS solution allows for it, and since they would share the same bus, it would not be worth it in the long run. _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Benchmark Timings: XP1800+
Last I looked, Intel doesn't have a 533/1066Mhz RDRAM chipset certified. They only spec their i850e chipset for 400/800Mhz RDRAM operation, although some motherboard makers are allowing the faster memory clock. The 850E supports 1066 RDRAM unofficially... The 845G supports DDR333 unofficially... In the case of the 850E, if you slap in PC1066 memory that is programmed properly (SPD) it will work at that speed... http://www.hardforums.com/showthread.php?s=618cc47b890c2bd0d9fd3a8f4c7a4 113threadid=440561pagenumber=2 Look at the 3rd message down... Note that I specified an Intel-branded motherboard... The link might get chopped in two, so you may have to cut and paste it... Further investigation on my part has verified this link... Mike (Xyzzy) _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: Benchmark Timings: XP1800+
What a difference RAM makes. I didn't find my specific configuration on the benchmarks page, so I am sending in this. CURRENTLY on the benchmarks page: Athlon XP1800+, 1533 Mhz, 133 DDR, L2=256-Full, 15-17M timing: 0.091 sec I have a virtually identical machine, except it is using mere 133 Mhz SDRAM. I'm CERTAIN the CPU bus speed is correct, and that the L2 is fully enabled, yet for an exponent smack in the middle (in the 16 millions) I'm getting only 0.116 sec out of it, on a barren (i.e fresh install, no other apps/services running) W2K machine (v22.7 beta). That's a TWENTY TWO PERCENT performance hit, just for not using DDR! A word to the performance wonks out there -- use the BEST RAM that your motherboard can take advantage of. One of these days I'll drop some DDR in there (sad to say, I don't have any spare right now), and see if it truly does drop down to 0.091 or thereabouts. _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
