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Heatsink Fan

post #1 of 8
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The fan on my Scythe Samurai heatsink blows out away from the CPU. Do you think i should turn the think around so its blowing into the CPU?
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post #2 of 8
mine blows in
cant complain..
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cant complain..
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post #3 of 8
an excellent question and one that I have seen arise many times. I think that decision can be made based on how your heatsink will spill the hot air onto the mobo and surrounding parts. On my mobo the hot air from the stock HS would fry the Northbridge HS and heat up one side of my RAM modules--when I put the zalman 7000 on it still directed air toward the CPU, but the shape of the zalman evenly dispersed the heat rather than pushing it out 2 sides.

Normally I find the air is pushed into the HS and this probably because it is easier to get cool air from the area away from the mobo/cpu/etc than to try and pull already warm air from those nearby components. Since the CPU is the primary concern that also explains why quite a few HS designs push hot air onto the mobo, northbridge, RAM.

Reversing the fan is an easy experiment--simply monitor befare and after temps--worth a try.
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post #4 of 8
Looking at the fans on the stock AMD coolers, they have a thermistor that will varry fan speed according to air temp. If you flip it so it sucks the air off the heatsink (blowing up instead of down) it'd be pulling hotter air away from the CPU, therefore speeding the fan up. I'm planning on doing this on my next build (Sub-$550 for my sister) and using a duct to take that hot air straight out of the case. Should be interesting to see how temps will do.
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post #5 of 8
Quote:
Originally Posted by Pinhead-227
Looking at the fans on the stock AMD coolers, they have a thermistor that will varry fan speed according to air temp. If you flip it so it sucks the air off the heatsink (blowing up instead of down) it'd be pulling hotter air away from the CPU, therefore speeding the fan up. I'm planning on doing this on my next build (Sub-$550 for my sister) and using a duct to take that hot air straight out of the case. Should be interesting to see how temps will do.

Aye, i also would like to know how that goes. When you do finally do it could you post about it? Perhaps a FAQ?
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post #6 of 8
Yeah, hopefully I'll have a camera by then. I'll take pics, post it all up and do a lot of experimenting. It'll all be in a mATX case.
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post #7 of 8
Again, just a thought, as you want to cool the cpu the best you want the coolest source of air possible--if you duct outside air to the HS and push the air from the outside into the HS you should get the best results--while rasing case temps somewhat--the other way around you are drawing air from the area around the CPU (warm) and causing a low pressure that will be pulling air into the case from any and all areas. This can cause dust issues with optical drives sometimes--depends on the case, other inlets, etc.
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post #8 of 8
Quote:
Originally Posted by CyberDruid
Again, just a thought, as you want to cool the cpu the best you want the coolest source of air possible--if you duct outside air to the HS and push the air from the outside into the HS you should get the best results--while rasing case temps somewhat--the other way around you are drawing air from the area around the CPU (warm) and causing a low pressure that will be pulling air into the case from any and all areas. This can cause dust issues with optical drives sometimes--depends on the case, other inlets, etc.
I understand that. That's why I'll have a 110cfm 120mm fan intake on the front of the case. With two silent 80mm exhausts, the PSU exhaust, and this CPU exhaust, I doubt dust will be as much of a problem (positive pressure). I'm hoping to have enough air flow to keep the ambient temp down low enough as to not effect my CPU temp. If it doesn't work, I'll just flip the fan around, no biggie. And since it's such a small case, that should be ample airflow to keep fresh air over the entire board. It's not going to be an exuberant overclock (low budget) so I doubt temps will be that much of an issue anyway. I'm trying to make it quiet while still having decent temps and overclock.

Edit: Sorry for the thread hyjack... I have another thread open. If you want to ask me about it, post there... Sorry.

http://www.overclock.net/amd-general...m-updated.html
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