Heat - The Dreaded Enemy

Its known as electromigration, and I have seen a couple of CPUs slowly degrade in OCability due to its effects. Sadly, my AXP2000+ @ 2200mhz is starting to feel it

Actually, electromigration failures are far more likely to be instantly catastrophic in their observable performance effects than not.

Gradual performance degradation failures are more likely form other mechanisms--such as threshold voltage shifts and several other things associated with the transistors and not the wiring.

The cheery confidence displayed by some overclockers that simply assuring a good die temperature is full protection from OC bad effects is misplaced. Some of the degradation mechanisms are primarily voltage dependent, with little temperature effect, while some of the other mechanisms have very strong temperature dependence. Still others respond primarily to temperature cycling.

Just a point of order. Electromigration is present in non-OC'ed CPUs as well, just to a lesser extent.

Are you saying the cpu temps are LOWER than Motherboard temps?? Were you running Seti on all cores? (or some other project app) If so, what kind of Zalman cooler are you using?

about temps from core2

not all temp programs read the core2 temp right

in some programs u must add 15°C in some other u must take off 15°C and some is near correct

so think about it
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Boinc runs here on:
Intel i7-3770K (Limited to 6 Cores)
Nvidia GT-630 (Fermi)

in some programs u must add 15°C in some other u must take off 15°C and some is near correct

The new quad is running at a lower temp than the 3.2GHz PentD that it replaced. As I mentioned at the beginning of the thread, the PentD was running about 65+C.

Actually, electromigration failures are far more likely to be instantly catastrophic in their observable performance effects than not.

Could you explain "coil-whine" to me? Im almost 100% certain I have a cpu suffering from it. making high pitched noises (yes, the cpu, not the mobo or anything else - ive checked) whenever its under load.

Well, I just suffered my first serious hardware fault from the dreaded enemy after 8 years of running Seti. This computer had an Athlon XP 1800+ which was a fairly quick CPU back in 2002. It ran seti non-stop from the moment I put my desktop together.

A few days ago, it would post, but would not boot into the operating system. I took it apart, checked the CPU and found a crack on the substrate right next to the chip. I'd say it was definitely heat. I have not overclocked the chip, and I used a standard AMD cooler.

R.I.P.

Luckily, I had an Athlon XP 2500+ lying around and not used =) So, I expect my RAC to go up now :)
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Just wanted to share my experience. Had a problem with booting, locking up, overheating etc... After hours of head banging and hair pulling, I found that the heatsink was not properly seated. I failed to notice that there is a step on it, and I had it oriented incorrectly. It appeared to be correct, and the retainers locked, but there was not 100% contact between the chip and heatsink. When I finally realized and corrected this, all the malfunctions stopped.
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I demand a refund. Oh wait, I didn't pay to join,
I VOLUNTEERED!

but there was not 100% contact between the chip and heatsink

A few days ago, it would post, but would not boot into the operating system. I took it apart, checked the CPU and found a crack on the substrate right next to the chip. I'd say it was definitely heat. I have not overclocked the chip, and I used a standard AMD cooler.

Ouch! Sounds like poor manufacturing (perhaps a bad batch). I still have an Athlon Classic running at 1.4GHz using a ceramic package that is working well 24/7.

I have an interesting heat problem at the moment... Namely the heat of the CPUs affecting the room they are in. We have a room segmented off for training at the office and with all the PCs in there crunching 24/7 it can get exceptionally warm when they turn down the climate control system on the weekends.

Luckily winter is on the way, but I'm not sure what I'll do come the summer (although hopefully by then I will have moved said CPUs, which are P4 dual cores into the main office and replaced then with new C2Ds that should run a LOT cooler).

I wish BOINC had the ability to monitor a temp prob and shut down when the temp got above a certain point, because it must have been 110F in the room on Sat. I've asked building maint to leave the AC a little higher on the weekend, so we shall see, else I think I'll have to turn the room off until the winter sets in properly :/

I wish BOINC had the ability to monitor a temp prob and shut down when the temp got above a certain point, because it must have been 110F in the room on Sat. I've asked building maint to leave the AC a little higher on the weekend, so we shall see, else I think I'll have to turn the room off until the winter sets in properly :/

At the risk of hijacking the thread: can somebody help a noob with information on "acceptable" CPU temperatures?

I've been running SETI and some other projects on a Toshiba Satellite A100 with a Pentium M dual core processor for over a year now. The exit air temperature seemed to be going up lately, so I downloaded the Intel TAT to look at the temps. The CPUs were running at 67 to 70C. After blowing out (but not disassembling) the air path, this dropped to 60 to 62C.

Is this cause for concern? Where can I find the manufacturer's recommend operating temps?
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