Hi, Check that both the stock fans are in fact operating. Are the fan power connectors in place properly? Can you verify both fans are rotating?
PC vendors will ship some surprising defects at times. In 1990 I bought the "hot box" of the time, a 386 with onboard cache clocked at 33Mhz in a big tower case designed to be a server. It shipped a week late after I called to complain about the delay. Straight out of the box it was flaky, running as little as an hour before hangs. It took me a week to sort it out myself, but I eventually found a memory chip with a pin folded back on itself rather than inserted into the socket properly. (This was back in the days of individual dual inline sockets for 1-bit-wide memory chips; this box had 72 of the 1Mbit chips with 18 pins each to reach 8Mbytes with error correction, plus provision for a daughterboard to put 72 more in for 16Mbytes; the daughterboard alone would have cost about what a new low end system now does.) Carefully straightened & reinserted and it's been solid since. It's on its second power supply fan, hard drive, floppy drive & a cdrom drive but still works reliably otherwise with a 486/66 cpu in 386 pinout & internal cache & Cyrix floating point coprocessor in place, 18.5 years later (not that it sees a lot of use these days). Ken At 10:39 AM 8/20/2008 -0400, Jeff Woods wrote: >[EMAIL PROTECTED] wrote: > >> I'm not an expert at overclocking or computer innards, but I can see two fans >> that appear to be drawing air into the case, though apparently none in the >> back--unless the massive heatsink assembly on (what I assume to be) the >> processor has one in it. >> > > >That big one is the primary processor heatsink. It radiates heat away >from the core of the CPU... and dumps it into the case interior. From >there, you need case fans to move the warm air OUT of the case, and >cooler air in... or you'll wind up with a greenhouse. > > >> I have run SpeenFan 4.34, and it gives temps of 43 to 50C when idle. > > >Welcome to the greenhouse. This is *way* high for an idle speed unless >you're seriously overclocked, and even then it's shocking. My two >systems average about 38C idle, both quad core. You definitely have a >cooling issue. > > >> While >> torture testing, the four cores reach as high as 65C, while a reading called >> Temp1 goes as high as 69C. >> > > >The chip itself isn't rated to go higher than 65C... so if Temp1 is >going to 69C, you are definitely overheating. By comparison, my two >systems average about 55C under 100% load of P95 on all four cores. > > > >> I've noticed that Prime95 seems to run into errors only when it is testing the >> longer FFT lengths (1024K or more). And I have recently run MemTest and got one >> error from it. So I'm suspecting bad memory may be to blame. >> > > >Not a chance. The system is too hot. The Memtest errors are likely >symptoms of the overheating. > >First... get some airflow OUT of the case. You need a 120 mm fan to >mount on the back of the case (there should be a place for it -- measure >it) blowing air OUTWARD. This will help the intake fans at the front, >and will remove more of the hot air. > >If this doesn't bring temps down substantially, your heatsink may not be >"set" properly. It may have an air bubble in the thermal grease, and >may need to be reseated. This should be done with top flight grease >(Arctic Silver AS5 or better) and by someone who knows how to get an >even application. > >Finally, if that big heatsink looks like this: > >http://www.cooltechpc.com/ctpc/images/intel_775_fan.jpg > >...then you will definitely want to replace it. That's the "stock" fan >supplied by Intel, and while it is suitable for typical home use, it is >absolutely NOT suitable for 24x7 Prime95. You want something more like >this: > >http://www.frozencpu.com/products/6873/cpu-zal-27/Zalman_CNPS9500A_LED_Ultr a_Quiet_CPU_Cooler_AMD_AM2754939940_Intel_478775Core_2_DuoQuadExtreme.html?t l=g40c14s52 > >Measure your case carefully and ensure that the heatsink you choose fits >-- the one I just linked to is quite tall, and wouldn't fit in a "thin" >case. > >Good luck! > >Jeff > > >_______________________________________________ >Prime mailing list >[email protected] >http://hogranch.com/mailman/listinfo/prime > Ken Kriesel, PE <[EMAIL PROTECTED]> _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
