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| Thread ID: 50784 | 2004-11-01 10:50:00 | Fans: Blast air on to CPU? Or suck it away from CPU? | george12 (7) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 286769 | 2004-11-01 10:50:00 | Hi there, I am trying to make a basic home-made system to keep my PC cooler. Some would say it doesn't run too hot (average 35 deg when idle, 48 when in heavy use), but if I set it doing some hard work when I come back it's frozen from heat (if I reboot into BIOS and check temps there its like 55). I believe it freezes at 58 degrees. Anyway, I managed to take the idle temp down from 40 to around 35, by connecting the CPU fan directly to the PSU so it ran at full revs all the time. By the way, I run the system with the PSU out of the case (not enough room for it), and the cover off). I then taped another fan I got (I have heaps lying around) to the side of the case, aligned with the CPU fan, blowing OUT of the case. However, when I put my hand in front of the CPU fan it seems to be blowing air onto the chip not away from it. So, I have my CPU fan (Intel stock) and 2 other randoms to play with. Where do I put them? By the way, the inside of the case, specially around the CPU but NOT in the way of the fan is really warm. I want to get rid of this hot air too. System: CPU: Intel Celeron D 2.4GHz FSB 533 Running at: 3060MHz FSB 170 (bus speed therefore = FSB 680) DDR400 RAM running at 1:1 ratio (170MHz = DDR340). So yeah, please help thanks. It's really annoying to leave it ... backing up ... a DVD and it's at 70% and you come back and .. blank screen you've lost it all. Cheers, George |
george12 (7) | ||
| 286770 | 2004-11-01 11:04:00 | Put the psu back in the case amd bolt the side of the case back on,both are needed in order to provide good airfflow over the internal components. | metla (154) | ||
| 286771 | 2004-11-01 11:07:00 | > with the PSU out of the case (not enough room for it) The PSU doesn't really fit with my motherboard. I'm getting a new case real soon. It does technically fit, but it completely smothers the CPU fan and the whole PC hits shutdown temp (60 deg) within a minute. Not a good look. So until I get my nice new case I have to have the cover off. George |
george12 (7) | ||
| 286772 | 2004-11-01 11:25:00 | > until I get my nice new case I have to have the > cover off. In that case (scuze the pun) you definitly need as much airflow onto the cpu |
Greg S (201) | ||
| 286773 | 2004-11-01 11:35:00 | Wire in one of these (www.dse.co.nz) | Rob99 (151) | ||
| 286774 | 2004-11-01 11:36:00 | I use a fair few older atx cases to build new systems for my work in places where looks don't count. (I don't give a toss what they look like) and do cooling mods on them using elcheapo fans. Amazing what u can do with an industrial hole saw and a dremel. All these old boxes have a hole drilled opposite the cpu with a fan blowing straight onto the cpu/heatsink. If the case is reasonably narrow I leave it as is. If its wide I use a cardboard or pvc tube to extend the intake of air to the cpu. Most of these older cases don't have exhaust fan mountiings on rear so a hole gets cut there ditto for the front inlet fan if no mount exists. Enough space on top between the cd and power supply an exhaust fan goes up there. Like I said some of these jobs are downright ugly but they get a decent p/s and they are meant for work( used by ungrateful sods who never turn the buggers off, write all over them and generally abuse the crap out of them) and not looks. Fan guards get pulled from old at power supplies. But like metla said you need everything in place to get a efficient stream of air across your mobo/cpu. | the highlander (245) | ||
| 286775 | 2004-11-01 11:36:00 | > Some would say it doesn't run too hot (average 35 deg > when idle, 48 when in heavy use), but if I set it > doing some hard work when I come back it's frozen > from heat (if I reboot into BIOS and check temps > there its like 55). > > I believe it freezes at 58 degrees. If it freezes at 58 then you have more serious problems than the heat from the CPU. 58 would be fine if that is the actual temperature. Remember onboard sensors are known to be not that accurate. As you are over clocking it more likely that your CPU cannot handle the over clocking. Remember that lower speced CPU's are most likely higher speced CPU's that failed to meet the higher specs so are sold at the lower spec where they can run properly. When you overclock you take the risk of an unstable PC. Put it back to it proper speed and if it does not freeze then you have found the problem. Oh and it does not matter how cold it goes with overclocking because temperature is not the cause of the problem. See another post around here for the reason. |
Big John (551) | ||
| 286776 | 2004-11-01 11:40:00 | George you are a worry . Mount the psu on the back of the case with tape or someting, maybee sit it on a box of wood or plastic as long as its stable and gets a/flow . The fan on cpu should suck air through the h/sink and eject it away, mount a fant at the front of the case make it suck air into the box mabee have two at the front of the box low . put side panel back on . Maybe tape up some holes on back of box at bottom . make air flow through the tunnel that is the case, the psu fan/s are supposed to be the Extractors, if they are not there you must put an extractor fan at the top rear of box . Maybee make some ducting from old cases and mount it inside if nessecary . Make the air flow in and out in a controlled manner, maybee put a perspex side on the box and use cigarret smoke at the induction fans and watch wtf is going on . If you have too many fans going too many ways you will retain hot eddys, if it has a hot eddy at cpu, it will still toast . Be more proffesional, and sientific . How can you build systems and sell them to people, if you really dont know what is going on inside a box? As in, how the Air moves around and how to make the Flow do as you want . Electicity/Air/Water/Numatics/and Hydraulics are all the same . They are all inherently lazy . The principles of mastery are very simular . D . |
drb1 (4492) | ||
| 286777 | 2004-11-01 19:34:00 | Crack out a 120mm holesaw or a jigsaw and cut a hole in the side of the case parrallel to the CPU, then mount a 120mm fan. Hey presto you'll have lower cpu temps. If you wanted to get really flash you could do a ducting mod from the blowhole to CPU so that the CPU only gets fresh air. You've got one of those horrible cases where the PSU is mounted vertically over the motherboard instead of horizontally above it. Get rid of the case imediately they were fine for passively cooled P2's but no good for today modern systems, especially prescott based celleries. |
Pete O'Neil (250) | ||
| 286778 | 2004-11-01 20:09:00 | drb1 > The fan on cpu should suck air through the h/sink and eject it away Have you got that round the wrong way? I've always believed you should be blowing air onto the heatsinc and CPU. |
POTUS (5276) | ||
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