Change direction of CPU heatsink fan >

newnovice · October 21st, 2003, 11:43 PM

Hello Everybody...

i was wondering, as my AMD athlon XP 2000+ is always running high temps-even though the cooling in the case is very good and the mobo is running at 22C. and all other devices are cold enough, i wanna try different methods of coolin. as of now the fan on the stock heatsink n fan is blowing down as it always does, i want to mod in to suck air away frm it(i have heard n know this would be better as there is the dual fan PSU fan right above it n will suck the hot air away). it will not fit on the heatsink if u just reverse it, i tried this. is there any other way.

as far as my electronic knowledge goes-if i switch the red n black wires it will not turn the other way. n the yellow is for monitoring. any ideas how to reverse fan direction.

ps: the point is i don't wanna buy a better fan or heatsink, n wanna get the best out of this.

all help will be appreciated.

Thanks Guys..
newNovice

DallasDon · October 22nd, 2003, 07:36 PM

for starters, the fan is designed to blow onto the fins of the heat sink. It is direct current, so reversing the wires will reverse the fan blades, but they at designed to blow in one direction, and will not move air very well in the opposite direction. Kinda like a helicopter, just static air.

My suggestion is a duct mod to move the fan off the heat sink a bit. This increases airflow due to the fan motor itself taking up so much surface area on the heat sink.

Next freebie thing would be to look at intake of ambient air from outside the case. Most cases do not have adequate ventilation, as it would also promote dust accumulation, if not properly filtered.

Run if with the side panel off, see if the temps drop considerably. If so, start poking some intake holes in that case somewhere.

frostDA9 · November 9th, 2003, 06:37 AM

I've always thought that in theory it would be better to do just that: pull the hot air AWAY from the heasink core. I've never tried it though. If you want to reverse the fan direction and try it out, don't worry about rewiring it, just unscrew it and flip it over.
If you do decide to give it a shot I'd be curious to know the results.

newnovice · November 9th, 2003, 11:45 AM

Yes I tried it, not with the stock fan, cos it wont go the other way so i got a CoolerMaster and put it the right way first blowing down on the CPU core, and the temps were 35-37 at idle, and 40-41 n full load. and i reversed the fan to push air away from the core, and the temps are a little higher, idle 38, and full load 41. remember i just changed the fan, the heatsink is still the stock AMD one.

I also wanted to know what is the sound and air spinning speed for the stock AMD Fan, cos the myine used to wrun at 4500RPM, and the cooler Master runs at 6000RPM

JPMiller · November 9th, 2003, 12:21 PM

Do NOT try reversing the airflow...you stand an excellent chance of frying the CPU...the heatsink you have is NOT designed to be used the way you suggest.
Dallas Don's suggestion of raising the fan off the heatsink with a spacer is a good one. also drilling a blowhole directly over the Cpu in the side of the case with a case fan drawing air in from the side down to the heatsink fan is also a good way to get cooler air directly to the heatsink.

sfw1960 · November 9th, 2003, 12:41 PM

The stock KooleR is JUNK -- my wife's PC was overheating one day ( I had the BIOS warning beeps set to 126 degrees F for SAFETY) The fins were all plugged up with dust & fuZZ so I replaced it ...
This KooleR is QUIET , low RPMs and it is very inexpensive!!
Speeze CPU Fan Model 5F263B1M3

http://www.newegg.com/app/ViewProduc...tby=14&order=1
$12 delivered!!
It works VERY WELL....my CPU is running @ 98 degrees right now (AXP2400+) and for the money - you can't beat it....
You still do need a case that "breathes" well....

Optimus Prime · November 9th, 2003, 01:15 PM

I have to disagree with you, the stock cooler is quite good, as long as you don't overclock.

I have 2 92mm fans and one 60mm CPU Stock cooler, average temps are 38-40*C.

newnovice · November 9th, 2003, 01:26 PM

Ooooooook, so i am gonna put the fan back to blow down, after i shut down.

and the other question, i have a 500W PSU with dual fan, and the secodn fan is rite above the blades of the CPU heatsink, and so it is sucking away all the air, and also i have a rear fan that is blowing out of the case. so i don't think the CPU fan is getting any air to blow at the CPU core, any suggestions,

i am planning on doing that window mod, and put a clear window wirth a blowhole...........

i know i will need lot of help on that, i will comne back to u guys for that pretty soon !!!!!!

Thanks
newNovice

newnovice · November 9th, 2003, 01:31 PM

i have same temps, and don't overclock, but i want cooler temops, as my mobo is just at 22C, so why shud the CPU be at 40C

butch81385 · November 9th, 2003, 01:48 PM

my suggestion is when you put your window and blowhole, do a duct mod all the way to the window. that way you will take outside cooler air and put it right onto the heatsink.. make sure you filter it though because, as you can see from the reply above, dust can kill a heatsink, causing the cpu to fry