Hi! I\'m sorry to say, but i have to stop my boinc client, because my PC is getting too hot! My MB sometimes reaches teh critical value of 55° degree and has to shut down in emergency mode. I\'ve bought 2 new coolers, but they don\'t work properly atm!
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You should underclock CPUs - less FSB or less multiplier
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You can also do the low tech method. Take the side off your case and place a box fan blowing directly inside. Of course, you'll want to clean very often.

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&gt; You can also do the low tech method. Take the side off your case and place a
&gt; box fan blowing directly inside. Of course, you'll want to clean very often.
&gt;
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&gt;

I've bought 2 additional Fans. But it didn't matter anything!
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How many fans do you have total? Make sure that you have your intake fans (blowing into the case) on the front bottom of the case, and the exhaust fans (blowing out of the case) on the back of the case towards the top (underneath the power supply, behind the processor). For most cases, this is the best setup. Also, it wouldn't hurt to make sure the cables inside the computer are tidy. Tuck away (behind motherboard mount, inside unused drive bays) too-long or unused cables, and consider getting round IDE cables (if you have ribbon cables). Cable clutter kills airflow.

Make sure your heatsinks are mounted properly: flat against the chip. Make sure that you have sufficient thermal grease/tape between chip and heatsink.

If this still does not work, consider getting new heatsink/fan units for your processor and northbridge chip. Make sure you tried all my other suggestions first, though.

By the way, what type of motherboard and processor do you have?

&gt; You can also do the low tech method. Take the side off your case and place a
&gt; box fan blowing directly inside. Of course, you'll want to clean very often.
&gt;
&gt; <a> href="http://www.boinc.dk/index.php?page=user_statistics&amp;project=cpdn&amp;userid=355"&gt;<img> border="0" height="80" src="http://355.cpdn.sig.boinc.dk?188"&gt;</a>

I bought a 5cm fan and screwed it to a PC slot filler....which I then bent so it was straight, instead of hooked at the top. Then screwed it down as normal in a slot - with the fan blasting away downward at the CPU and mobo.

Worked great.
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I have resently changed all of my boxs over to cases with fans on the top to pull the hot air in the top of the case out. Depending on the proc this seems to be worth 3 to 4 degrees.

Here in the desert dust bowl of Las Vegas, Nevada I've had the CPU heat sink get clogged up with crud. Taking the CPU cooling fan off and sucking out the dirt (with a shop sized vacuum cleaner) works for me. I do this housekeeping about once every 3-4 months on all my boxes. Cheers!

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I have to do the same every now and then.

IMHO, if a Machine overtemps while under full load (under normal environmental conditions), something is wrong with it.

For most modern Systems, an "el cheapo" Case with poor Design is an absolute Killer, that won't only overheat the Components while running BOINC, but eventually when using any computing-intensive Applications.

I've almost completely standardized the x86-component of my Network with rather inexpensive, but more or less cooling efficient Cases.

Especially when running Distributed science full-time, even with no critical overheating, a permanent insufficient cooling brings the issue of reduced component lifetime with it.
(I've seen several Fans but also Capacitors on Motherboards reach their EOL within 1 year or less after last years really hot summer around here; so far I've lost 2 (older SuperSocket7) Systems due to catastrophic thermal failure of a VRM Module and/or failed capacitors. Both consequently led to total losses of those Systems respectively.)

PS.
I don't know of any CPU that would require special attention at 55 deg. Celsius already, maybe the Warning Temperature is set just too conservative and sets off the Alarm plain too early.

If it's actually the Motherboard Temperature however, 55 deg. Celsius is way off scale indeed. During the hottest times, I've never seen any of mine exceed 45 deg. Celsius (which is my personal red-line limit for temporary (!) continued safe operation, for the sake of the System's lifetime)
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You could use Motherboard Monitor 5 www.mbm.livewiredev.com to shutdown and restart Boinc GUI at predefined temps. Had this problem with an Advent box with cheap MOBO. Changed to ABIT MOBO and now stable. Try running Prime95 torture test www.mersenne.org to prove if box is stable.
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