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Help!!! Overheating Problem

 
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i built an AMD-Athlon 850Mhz last year and i am having some heating problems. i have 5 fans in the box so far (there aren't any more spots left) but my processor temp is still going above 154f degrees (overheat is 140f)... the overall system temp is getting up to about 85f degrees.
i have 1 fan in the front for in-take, 2 fans connected to the heatsink, one fan with the power supply and another for exhaust.
my computer has been shutting off without warning lately, and overheating is all i can think of... does anyone have a suggestion of how i can keep my processor cooler (without packing it in ice)?
 
Greg Harris
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yes, i am replying to myself
has anyone here tried water cooling before? i have browsed around the web and it seems to be rather prevalent among some serious computer geeks.
i have a little experience with chilled water systems from being in the navy and having a system that put out over 750KW of power... i think i can build a water cooled heatsink with a pump from a fish tank, but i am not sure what to use for the resevoir.
any suggestions?
 
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Are you overclocking this chip? I assume you are because otherwise you have a serious problem somewhere. Even if you are OC'in that temp is WAY TO HIGH!!! Gimme some more details about what your system is and what you have modified. Have you upped your corev? Stuff like that. Then i can maybe help ya.
 
Greg Harris
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thanks for the interest, andy.
no, i have not overclocked my chip. this is my first project, so i might have screwed something up here.
Abit KA7-100 mainboard
AMD Athlon 850 Mhz
384M PC-133 RAM (Corsair)
30G Maxtor Hdd - 7200 RPM
300 Watt ATX power supply
SoundBlaster Live sound card
Rage Pro 128 3D graphics card
the cards are spaced apart to allow better airflow... there isn't anything blocking the air to the processor (though the flow is not directly on it). when i first boot, the temp is around 120f... but within 20 minutes it is up to 145f+. i suppose i can buy one of those fans that go in an empty drive slot in the front of the tower just to add some flow.
the system is triple boot with win98, 2000 and Redhat 7.0... obviously the crashes happen most often with 2000, then 98... Linux has yet to crash, but i do not run the GUI very often.
thanks again!
 
Andy Ceponis
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Ok, if your system is stock, then there is no reason why you should need any extra fans at all. Adding more fans will not do anything for you except make your wallet lighter and the room noisier. You have a problem somewhere. Im assuming you built this yourself so when you assembled it did you use thermal grease between your hsf and cpu? Is the hsf attached firmly onto the chip? The littlest(is that a word? ) things can make a huge difference. I have a similar system as yours. I have the athlon 750 chip. I have no problems at all. I also have a tbird 1.33 chip and in that system i know you can burn out a chip in 8 seconds with improper cooling. So take off your hsf and reconnect it firmly and check for the thermal paste. Make sure there isnt too much or too little, as that can have a negative effect as well. Lemme know if youve already done this. It sounds like this might be your problem.
125f is fine for running at. But 145 means there is something wrong. I have my tbird oc'ed to 1.53 and its running at full load at 50c which is 122f. Lemme know what happens.
 
Greg Harris
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okay... now i feel stupid! after all the time i spent working on electronics in the Navy you would think i would know to use thermal paste to make a better "connection" between the sink and the processor. i had a little problem making the sink and processor join together initially, but i thought i had it fixed.
i have been surfing around and ran into that a couple times so far this morning. they say radio shack has the stuff, so i guess i will swing by on the way home from work!
oh yea... how much is too much? they say too much will hinder the heat transfer and too little obviously will not do enough. i am guessing just enough to make a complete connection.
thanks again, andy! i will post again with the results of your help.
[This message has been edited by Greg Harris (edited May 08, 2001).]
 
Andy Ceponis
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Well for the slota athlon like you have which is a good amount larger than the socketa chips because of the case i would say use a pea sized dollop. You can always use a bit extra and just use a razor or credit card to scrape the excess off. All you want is a very thin coating. Just enough so that all the imperfections on the metal will be filled with paste and it can touch the hsf.
Yes radio shack sells thermal paste and it works just fine. For your next project i would suggest ordering some Artic Silver thermal paste online. That stuff is of better quality and a better conductor. But the RS stuff is plenty good. Hope that helps.
 
mister krabs
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try leaving one of the sides off the case.
 
Greenhorn
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Having many fans in a case doesn't translate into cooler temps. Once you have the proc. fan in place you need to consider how the air is flowing through the case. There are a few things you can do to improve airflow:
1) Bundle all your cables and move them to the side, to better allow for airflow
2) Remove or flip conflicting fans. If all the fans are blowing air into the case and only the power supply is exhausting it, then you'll have problems
3) last resort is taking the cover off and plcing a room fan pointed toward the box.

Good Luck
 
Greg Harris
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well, i have the cables bundled and out of the way... i did learn that while i was in the Navy.
i have the power supply fan blowing out as well as another 4" fan in the back... 1 intake, 2 exhaust and 2 on the heatsink.
i would rather not take the panel off because i do not want to get any more dust in there than necessary. i am going to take it off though just to see how much of a difference it makes.
thanks for the ideas and i will let you know what happens.
 
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Wow Greg .. I've got an AMD-K62 475MHz that was overheating on me last year. I gave it a good dusting and moved it to a more open area. It's been fine ever since (touch wood). Have you got lots of space around your unit? Even with the thermal paste mine got to hot in the small area where I originally used it.
[This message has been edited by Jane Griscti (edited May 08, 2001).]
 
Greg Harris
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well... i didn't want to admit this, but my case could be in a little more "space friendly" environment. now it is in the middle of the floor.
my radio shack did not have thermal paste so i am going to a techie super store tomorrow.
so, i opened the case, dusted it out (really no dust to dust) and left the cover off. the initial temp was 125f, 30 minutes (and 3 intense games of pinball on win2000) later the temp was 138f. i played the pinball game because that is the most graphics intensive one i have installed.
now, another 30 minutes it is hanging around 140f... i have my dial-up connection going and i am typing this and web-browsing on my laptop through the network. i am trying to see how hot i can get it in a short amount of time, and it seems to be doing better.
i will see what the paste does in another day or 2.
 
Greg Harris
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okay, this is too good to be true...
after experimenting with taking the cover off and moving my case to an open area i was not getting good results. the average temp went down to 138f, but i thought it could be better.
i put the cover back on and let it run for a while... the temp went up to 141f. i felt the back where the exhaust fans are and noticed not much air was getting out.
so, i decided to turn one of the fans around. now the temp is 107f when it is idle and around 113f when i am working the CPU.
the way my case is set up, there is a fan at the top, then the power supply / fan, and a fan under the power supply. my CPU is almost direclty in front of the bottom fan. i turned the top fan around so it is now an intake. this makes the air flow in the top (back) and over the power supply, down and over the CPU and then out the bottom fan. there is also an intake in the front at the bottom of the case, but that air is going under the CPU.
i guess i had too much exhaust going out so there was kind of a vaccum in the case. i am going to watch it for a few days to make sure this is really working.
thanks for the help!
 
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