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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: halfscot who wrote (4539)	12/31/1998 2:54:00 PM
From: doniam	Read Replies (1) \| Respond to of 14778

Your overclocking experience makes me feel better about the system I just bought. I'm running a Celeron 300a @300mhz BIOS shows system temp from about 85 to 100, mostly around 95 using 2.03v for the CPU. My plan is to overclock to 450 in a few days. I have an extra fan and when I next take the cover off I'll check the air flow direction. The mother board is BH6. -Don

To: halfscot who wrote (4539)	12/31/1998 3:02:00 PM
From: pae	Read Replies (1) \| Respond to of 14778

[convection] Halfscot, I think your unexpected higher temp may be due to 2 things: 1) Air drawn past the power supply has already cooled the power supply. 2) You have lost efficiency by fighting convection. Warm air rises, cool air falls. If you disabled both case fans (the power supply fan apparently counts as a case fan) you might notice a very slight natural convection - warmed air would rise out of the back rear of your InWin and cool air would flow into the low side and front vents (am assuming a Q500 though I don't really know). Not that I have any exclusive rights to "the" correct solution; I chose to flip (reverse the flow of) my Q500 power supply fan so that the power supply is cooled by air sucked from inside the case and blown thru the PS out the back. I left the low front fan blowing in. The idea was to work with as opposed to against the natural convection. I'll agree with you ahead of time that convection flow is likely trivial measured in air volume. But I would rather have those few percent working with me than against - 105% of fan throughput versus 95%. Good luck, Paul (300a running 466 @2.1v)

To: halfscot who wrote (4539)	12/31/1998 3:13:00 PM
From: NickSE	Read Replies (1) \| Respond to of 14778

halfscot, I tend to agree with Paul on case air flow and here's why. heatsink-guide.com Should the fan in an ATX case suck air out or blow air in? According to the ATX specs, the power supply fan should blow air into the case, through the power supply towards the motherboard. The idea behind it was that this way, the CPU would be located directly in the airflow and would get along with a passive heatsink. However, as the power supply gets hot, too, the fan would blow warm air towards the CPU, which of course isn't a good idea. In addition, even with a PS fan blowing onto them, modern CPUs wouldn't get along with a passive heatsink anyways. So, many case manufacturers are ignoring the ATX specs and are shipping their cases with a PS fan that sucks air out, which IMHO is a good idea. If your PS fan blows air in, it might sometimes be beneficial to reverse the fan (you must reverse the entire fan, reversing polarity won't work and might even damage your fan). Hope this helps, Nick