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A Cool AND Quiet Duron

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sleddog

Member
Joined
Dec 17, 2000
I've been experimenting for the past few weeks with ways of cooling my Duron [email protected] (around 950, I've played with that too). The Delta black label fan on a PAL6035 does an excellent job, but I can't stand the noise. The answer I thought was an 80mm fan on the heatsink. I bent up aluminum and glued pastic together in various shapes to make 80-to-60mm adapters. All were bulky, time-consuming to make, sometimes fragile and always ugly :) As well, the cooling performance wasn't that great (usually 3-4C hotter than the Delta).

I've finally arrived at a simple and effective solution. To mount an 80mm fan on the PAL take a 80mm wire fan grill, turn it upside down and attach it to the PAL with 3 woodscrews. If you get the right size screws they'll thread down between the heatsink fins without bending things out of shape too much. I put washers between the grill and the heatsink to raise the grill off the heatsink about 2mm. Next slip a couple 1.5" carriage bolts (1/8" diameter) up through the mount holes on the grill and attach the 80mm fan (with nuts). I used only two -- on diagonal corners of the fan. My fan is set to suck air away from the heatsink.

Next I ducted the 80mm fan to outside the case. I made an 80x80mm (inside) duct that slips over the fan and exits through the side cover. Now with an extra fan drawing air out of the case, more intake was needed. I added a quiet, low-cfm 80mm to the bottom front area of the side panel. The 80mm on the cpu is much more powerful than this fan, but its output is reduced by the drag of the heatsink and I don't run it full speed -- so the two fans more or less balance.

In addition I have an 80mm intake bottom-front and 80mm exhaust top-rear. I wired these two fans together on a 7v/12v toggle. I wired the 80mm CPU fan to a second 7v/12v toggle.

Results? With both switches to 7v position I idle at 33-34C. With Prime95 or Seti I'm usually at 35-38C with room temperation at 18-20C. And it is SO SO quiet!!

[Note: I'm using a temporary cardboard side cover, with a cutout for the CPU duct and the extra intake fan mounted on it. When I get up the nerve I'll cut the real cover :) ]
 

FBRopz

Registered
Joined
Feb 13, 2001
Truthfully on the Duron, the Superorb by thermal take woulda probably done you pretty well, what were your temps looking like before this construct?
 
OP
S

sleddog

Member
Joined
Dec 17, 2000
Roughly the same with the PAL and the Delta fan running full speed. I doubt a superorb could match that.

But you miss the point. My objective was to keep it cool (under 40C) and quiet. The setup I describe is much quieter than any high-speed fan. In fact it is much quieter than the relatively quiet Sunon 60mm 23cfm.

Current config:
8.5x110=935MHz
1.60v (MBM says 1.65v)
Prime95 torture test running for 1/2-hour

Current temps:
Room: 18C
Motherboard: 18C
CPU 36C

Noise level: Very, very low!
 

Fink

Member
Joined
Dec 18, 2000
Pictures, where are the pictures? Sounds like you had some great luck!

BTW, I agree with the senitment on the orb coolers - I never got good cooling with any of them, even lapped. Best cooling that I have seen has been with either a plain old alpha or global Win cooler...
 
OP
S

sleddog

Member
Joined
Dec 17, 2000
Sorry... no camera; have to see what I can do. But I did salvage a 92mm fan and grill today. Hmmm, wonder what *that* will do on the PAL....