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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 | ||
| 286809 | 2004-11-02 03:33:00 | > 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. Yep. I know it's got to go. It worked OK for it's previous mobo/cpu (Cel 1.2GHz), but it completely blocks any airflow for the CPU in this setup. The problem with it is is it's just TOO DAMN SMALL. Getting a new one now. And it has no space for a back fan, but it does have a front fan hole. I'll mount a fan there. George |
george12 (7) | ||
| 286810 | 2004-11-02 03:35:00 | Oh and of course I put it back down to 2.4GHz. And drb1, I do know exactly what is going on in my box, I am simply looking for a workaround to my temporary, unique situation. George |
george12 (7) | ||
| 286811 | 2004-11-02 03:37:00 | A temporary work around would be to place a desk fan next to the side of the case so its blowing fresh air directly over the CPU. Dont waste any money on your current case invest it in a new case. | Pete O'Neil (250) | ||
| 286812 | 2004-11-02 03:51:00 | There is also another reason to blow air down at the heatsink rather that suck it away. If you blow the air down at the heatsink, you are concentrating the airflow on a small area. This means that the full pressure of the fan is exerted directly downwards, which helps to keep the heatsink from clogging with dust - it gets forced through the vanes if the heatsink. However if the air is sucked, you get the same force spread over the entire sides of the heatsink. This means you get a lower pressure, and the dust is more likely to just stay stuck on the side of the heatsink rather than being blasted through. This is why most shop-assembled processors I have seen will blow air down onto the CPU, it means that their less knowledgable customers don't have heat problems. Bletch |
Bletch (244) | ||
| 286813 | 2004-11-02 03:56:00 | I hate to tell you this,but i have cleaned about 50 billion heatsinks that were chocker with dust,and if the large majority of set-ups blow downwards (which apears to be the case) then they are subject to build-up as well. And it sucks telling people that the answer to ensuring the health of their PC is to get off their backsides and vacume the damn carpet from time to time.... |
metla (154) | ||
| 286814 | 2004-11-02 04:08:00 | Now that is an interesting problem, I feel Metla has a point. Maybe the thing to do is to spray teflon into the heatsink so as to help prevent the dust sticking? | Terry Porritt (14) | ||
| 286815 | 2004-11-02 04:12:00 | I keep alternating between one view and the other. If the air speed is lower around the heat sink it is less likely to carry the dust in. | Terry Porritt (14) | ||
| 286816 | 2004-11-02 04:12:00 | > I hate to tell you this,but i have cleaned about 50 > billion heatsinks that were chocker with dust,and if > the large majority of set-ups blow downwards (which > apears to be the case) then they are subject to > build-up as well. I agree, the dust will build up both ways. However the heatsink will clog up faster with the fan sucking. Elementary laws of physics. And many people why buy a PC don't even imagine that it needs to be cleaned at all, so they don't think about even opening the case to check. Bletch |
Bletch (244) | ||
| 286817 | 2004-11-02 04:14:00 | > I keep alternating between one view and the other. > If the air speed is lower around the heat sink it is > less likely to carry the dust in. Exactly. The dust gets stuck on the side of the heatsink when sucking, as opposed to being blasted through (most of it anyway) when blowing. The other fans in the case are what actually carry it in, the CPU fan just picks it up out of the case. Bletch |
Bletch (244) | ||
| 286818 | 2004-11-02 04:15:00 | Teflon's a good insulator. A layer of that (over anodized aluminium) might generate a good static charge from the air flow, and become an eletctostatic precipitator (and dust collector). :O I think the only way to keep the CPU cool will be to turn it off. ;-) |
Graham L (2) | ||
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