On Sunday 26 Jan 2003 2:17 pm, Tom Brinkman wrote: > On Sunday January 26 2003 01:43 am, Paul wrote: > > Yes, they both show on LM Sensors (through Gkrellm). > > The CPU (Athlon 1200) shows 78C (149F) and something else shows > > 29.2C (75.5F). I am not sure if I set the multiplier readings in > > Gkrellm correctly, but this is what I also could see (plus or minus > > a few degrees) when then machine was still upright. So no change > > there. > > Type 'sensors' in a terminal if you aren't sure you have gkrellm > configured correctly. If 'sensors' is showing 78C, that's your > "weirdness" problem. First of all, AMD Athlon's (unlike Intels) don't > have an internal diode for reporting the actual core temp. An > external probe is used. AMD says to add 10 to 20C to the probe temp > to better approximate the actual core temp. > > IME, about 12C (10C from a pin probe, to 15C for a contact probe) > is the typical amount to add. To illustrate, silicon is an insulator. > Measuring the internal temp of a cpu with an external probe is sort'a > like tryin to measure the temp of electrical wires inside a wall, by > mashing a thermometer against the plaster. OK, maybe that's a little > exageration, but you get the idea ;) > > AMD specs Athlons to fail at 90C core temp. This upper limit will > be lowered if you overheat the core even once, but it usually takes > several times. When you see 78C from the probe, your core temp is > probly 90C, maybe even as high as 98C. Poof! You're lucky the system > quits, rather than completely fryin that Athlon and the motherboard. > > Re-mount your heatsink on that athlon squarely and firmly using > thermal grease, not a thermal pad. The $2 grease from Radio Shack is > all you need. Apply a thin layer. Keep your case temp as close to > room temp as possible. You should be able to keep that cpu under 55C > from the probe, even under sustained 100% load. 'Course the 55 probe > is really upper 60's core temp, but far enough under 90C that even > occasional spikes in the core temp shouldn't cause failure. > > After fixin your heatsink, see if the system won't run properly > (upright). If it's still runnin too hot, try pointing a table fan > into the case with the cover off. If you can then run at more normal > temps, you need to improve your heatsink, fans and case ventilation. > If you still have "weirdness" with improved cooling, it's likely you > overheated the core one too many times and the cpu is internally > damaged. You may have also caused some damage to the capacitors on > the motherboard, particularly those surrounding the cpu socket. > > If you suspect you've permanently damaged the cpu/mobo, all is > still not lost. Underclock it, if the mobo supports it. The > multiplier on that 1200 is not locked. Keep the FSB at spec, but try > dropping the multiplier by .5 to as much as 2. IOW's, if it's 9x133, > try droppin the multiplier to 8 or 8.5. If it's a 100mhz FSB cpu > (12x100), try 10 or 11x100. Might keep you goin till you can replace > the system. If it comes to that, I strongly suggest you only use AMD > recommended power supplies, motherboards, and heatsinks, if you > aren't now doin so.
Tom - I'm not doubting you, and I'll certainly keep this post for reference, but how is that affected by orientation? Why would it run longer if on its side? Anne -- Registered Linux User No.293302
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