Author: Aaron Gordon
Date: 12:53:31 07/08/03
Go up one level in this thread
On July 08, 2003 at 15:40:39, Mr j smith wrote: >On July 08, 2003 at 15:30:26, Aaron Gordon wrote: > >>On July 08, 2003 at 09:48:26, Rajen Gupta wrote: >> >>>i have noticed on all 3 of my overclocked computers that certain chess engines >>>don't run well, in particular junior 8/ hiarcs8 & shredder 7/704. >>> >>>on a single overclocked comp if any of the above engines are running; the >>>computer will either reboot/ freeze/ crash or give an error meesage, after >>>playing only for a few hrs.this happens each time i have tried to play eng vs >>>eng matches using any of the above engines. >>> >>>these comps have been stable for all other programmes, inculding chess >>>programmes; i have been able to play the following engines-the king engines >>>(both 3.12d and 3.23); fritz8/7 df7/ the tigers for weeks on end in eng vs eng >>>matches without the above problem; >>> >>>initially i thought that the problem was with the software but after setting the >>>hardware to default settings; junior8 vs f8 are running smoothly for well over a >>>week. >>> >>>i am particularly interested with AMD overclocked systems as i plan to buy an >>>overclocked modified dual (XP modified to MP guaranteed to run at 2400 mhz) >> >>Just sounds like you're overclocking too much. Could be you need more voltage to >>the cpu, you need better cooling, the chipset/ram can't handle the FSB you're >>trying to do, your PCI/AGP could be too far out of spec, etc. Could be a number >>of things. >> >>If I were you I'd grab CpuBurn @ http://users.ev1.net/~redelm/cpuburn4.zip >>Also get Prime95, available at ftp://mersenne.org/gimps/p95v2212.exe >> >>Run each of these for 24 hours at the speed you believe is unstable. Also, test >>your memory at... http://www.memtest86.com >> >>If you're pushing the chip higher via FSB you could be keeping your ram timings >>too tight and while the ram may be able to do the speed you're running, the >>timings may just be too low. Try testing with Memtest86. If you get errors relax >>the memory timings and retest. If you still get errors drop the fsb or up the >>voltage to your memory (if you have that option). Don't go above 2.9v for 2.5v >>DDR. People have run 3.0-3.5v.. but 2.9v is the maximum 'safe' voltage for >>extended operation (years & years). >> >>Also if you want to get accurate temperature readings get one of these: >>http://www.bestbyte.net/Product.cfm?ProductID=525&CategoryID=8&Keyword=nurse >> >>Motherboard sensors are more often than not very wrong. I have 11 operational >>computers in my house that tell CPU/board temp.. and not a single one is >>accurate (not even within 5C). The one with the most difference is the Asus >>A7V266-E, which shows 21C too high.. followed by two Abit KT7a boards that are >>both 15C too high. Just slide the comp-u-nurse sensor between the PGA of the CPU >>and the heatsink up against the side of the cpu core. This will give you a very >>accurate reading. >> >>Basically, just play with your hardware (not like that) and see what can do what >>speeds. When I first build a computer I like to see what the CPU can do, the >>ram, chipset, etc. Once you figure out the limits you can then figure out the >>best multiplier/fsb combination to get maximum performance. If you want to keep >>it simple just run BurnK7 and Prime95 (not at the same time of course) and if >>you get errors, lockups, reboots, etc.. keep backing off until you can get it >>stable for 24 hours. >> >>If you want to put your hand (or a book or something) over the fan to >>artificially increase the temperature of your CPU that would work as well. If it >>runs seemingly stable at 65C (even 10 minutes of Burnk7/prime95) it'll >>definitely be rock solid at 40C. Just make sure you keep the heatsink free of >>dust and etc, or you'll be visiting 60-70C again. :) > > >The only thing I would add is that playing with a chessprogram stresses a cpu >more than Prime95 or any of the other stress utilities. If your computer can >play an 80 move game of at least an hour to an hour and a half with any of the >commercial engines and not reboot, then you have proper cooling and the system >is stable. I'd have to disagree there. Just recently did some tests where I analyzed a position all night.. it ran fine. I closed the chess program, ran BurnK7 and the system rebooted instantly. This wasn't a cpu instability problem however, it was a problem with the motherboard not being able to supply enough power.. making the vcore drop from 1.85 to 1.63v under insane load (going from idle to full load w/ BurnK7). This is why I use BurnK7/Prime95 to test instead of anything else... I haven't found anything as stressful as either one of those programs yet. They really do a good job. About Hyatts post.. seems as if he thinks ALL overclocking is bad. This isn't true. It's like going fast in a race car. It's ok to soup up your car & go fast.. but going "too fast" isn't good. Same thing applies to overclocking. Know the limits, test everything, make sure it runs rock solid. If you push it too much you'll definitely have problems.. but.. that applies to basically everything mechanical on the planet. Again, know the limits.
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