On Monday 17 March 2003 21:20, you wrote: > Hi > I had let my computer work on factoring for a while, and I switched back to > LL testing two days ago, and last night my computer was beeping all the > time because the cpu and the board were overheating... There should be no > problem with my hardware, I got good fans that I bought 3 months ago, and > everything was fine until yesterday... I have a P4 1.5 Ghz... There's > something weird I noticed but I don't know if it's a factor and it is that > SiSoft Sandra indicates the voltage sensor is detecting -8.7V and -3V for > the -12 V and -5 V respectively...
Weird. Did you try a different version of Sandra? I suspect the version you're using doesn't understand the chipset properly. > Does anyone have an idea? (sure! ;-) ) Does version 23.2.1 of prime95 > (which I'm using) use the cpu more efficiently (and overheating it as a > consequence) than the previous versions which weren't causing any problems > on my current configuration? > I doubt Prime95 version has much to do with it. The P4's I have are all Northwood processors (1.8A, 2.53 & 2.66); the slower two have been running since v21 & I haven't seen any significant jumps in CPU temp with version (note, I use mprime rather than Prime95). It's certainly true that running LL tests (or DC assignments) will drive the chip hotter than running factoring, because the parts of the chip involved in SSE2 will be fully active instead of more or less idle. Other things which could be a significant factor: (a) chipset setup - usually you can mess around with fan speeds and/or thermal throttling to change the balance between speed/power consumption and noise/battery life - particularly battery life of notebooks. Note, sometimes this setup can be affected by power saving parameters settable from within the running operating system as well as through the BIOS at system boot time. (b) systems which have been running for a while often accumulate dust, this can get stuck in between heatsink fins & reduce efficiency of cooling. However, fans do sometimes fail (even under 3 months age); my guess is that your CPU cooler fan has deceased. The thermal control circuitry embedded in the P4 does at least keep the system limping along with a failed CPU cooler fan. If the heatsink itself is halfway decent, and the case is properly ventilated, overheating could well fail to occur unless something heavy like LL testing is running. Regards Brian Beesley _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
