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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 | ||
| 286779 | 2004-11-01 20:17:00 | He is correct,hot air is removed by the fan,then ejected from the case by the psu or other extraction fanes,this causes a cycle where as new cold air is passivly sucked in through the front of the case. Its a commen mistake though,i see a boatload of fans mounted the wrong way because people don't understand the concept.... |
metla (154) | ||
| 286780 | 2004-11-01 20:20:00 | > 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. It actually depends on the design of the heatsink. There were a few heatsinks that were designed to suck air away from the heatsink, I think Alpha made a couple of designs like this but could be wrong. You'd be hard pressed to find a current heatsink thats designed to suck, just about all modern heatsinks are designed to have cool air blown over them. You could always experiment and find out what is best for your current heatsink, aslong as you keep an eye on your temps when sucking there wouldnt be a problem. |
Pete O'Neil (250) | ||
| 286781 | 2004-11-01 20:23:00 | Whats that Pete? The fans are designed to move air away from the cpu,which is "sucking". |
metla (154) | ||
| 286782 | 2004-11-01 20:39:00 | Most CPU heat sinks are supposed to have the HS fan blowing air down onto the heatsink. I hope you don't spend too much time changing them :-) | PaulD (232) | ||
| 286783 | 2004-11-01 20:49:00 | As far as im aware their designed to have fresh air blown down onto them. Well thats how every preassembled HSF ive ever broughts been assembled, including all stock AMD coolers. | Pete O'Neil (250) | ||
| 286784 | 2004-11-01 21:00:00 | When I built this computer I used a AMD 2000, the fan was already fitted to the heatsink and blows air away from the CPU, or sucks air through the cooling fins. I have made no modification to it, just pulled it out of the box the fan was already fitted ex-factory. I have built a few computers and I think they were all the same.(altho I didnt test each one) |
Rob99 (151) | ||
| 286785 | 2004-11-01 21:15:00 | > Most CPU heat sinks are supposed to have the HS fan > blowing air down onto the heatsink. I hope you don't > spend too much time changing them :-) No,I obviuosly don't change the fan on the heat sink. However the heatsink is designed for the heat to be transferred into it from the cpu,and then the heat is expelled with the fan,Blowing down onto it would be pushing the heat back towards the cpu,and then it would expell outwards and either create turbulent hot areas in the case,or the newly heated air would be grabbed by the cpu fan and blown back over the cpu,heating up even further........ The idea is for the heat to be absorbed by the heatsink,then expelled by the fan,with colder air moving in,heating up and being expelled,all the while the extraction and psu fan remove it from the case. |
metla (154) | ||
| 286786 | 2004-11-01 21:16:00 | Never come across a sucker before but, the word seems to be that there is [u]one[/url] manufactured every day ;) Must be your ones. Cheers Murray ;P PS. AT least with a blower you can pull fresh air in from a chosen place. With a sucker it's less precise although it would be easier to exhaust, assuming a fairly standard heatsink. |
Murray P (44) | ||
| 286787 | 2004-11-01 21:25:00 | Heat doesn't get pushed through a solid object by air . Heat will always transfer towards the coolest part of an object, If that is the top of the fins on a heatsink, that is where it will be conducted to and, if the air is cooler again than the metal, it will transfer to that . So, the more efficient the conductor, eg; copper vs aluminium, the faster this can happen . Reducing the distance between the heat source and the coolest part of the sink helps too along with the volume of cooler air . Cheers Murray P |
Murray P (44) | ||
| 286788 | 2004-11-01 21:27:00 | Who said anything about air pushing heat through a solid object? | metla (154) | ||
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