has anyone used CPU heatinks for small jobs?

jarthel · 14th June 2006, 01:40 AM

I was thinking of using the heatsink I got from my AMD64 3200+. I need to dissipate at least 10W. I got a feeling these heatsinks can handle the job.

thanks for the replies.

jcx · 14th June 2006, 01:46 AM

Has anyone used the Search function before posting?

try entering:

cpu cooler

in the exact phrase box

Duo · 14th June 2006, 02:53 AM

Most of those heatsinks, with fan, will dissipate much more than 100W depending on how hot you want your parts to get.

For example, some modern CPUs will dissipate 70W into a heatsink that size.

I have used an early pentium heatsink with fan for a 120W amplifier channel and it worked well. The only thing is that you overheat if the fan isn't running.

jarthel · 14th June 2006, 03:05 AM

Quote:

Originally posted by Duo

The only thing is that you overheat if the fan isn't running.

but surely if I only need to dissipate about 10W, I wouldn't need a fan?

AndrewT · 14th June 2006, 11:30 AM

Hi,
some of the bigger fanned sinks achieve Rths-a around 0.3C/W.
Removing the fan will reduce dissipation by at least a factor of ten.

If we assume 3C/W then the sink will run at 30Cdegrees above ambient when dissipating 10W.
What is your maximum ambient?
What insulator are you using between device and sink?
What maximum case temperature can you tolerate long term and short term?

Yes, it is feasible, but you have a lot of calculating and measuring to do. Are you up to it? Seems you avoid work so far.

I have used a CPU cooler to keep power amp driver transistors cool. The main sink heated the drivers rather than cooling them.

EWorkshop1708 · 7th July 2006, 04:58 AM

They work fine, but the issue is mounting your devices to them securely.

14th June 2006, 01:40 AM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	has anyone used CPU heatinks for small jobs? I was thinking of using the heatsink I got from my AMD64 3200+. I need to dissipate at least 10W. I got a feeling these heatsinks can handle the job. thanks for the replies.

14th June 2006, 11:30 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, some of the bigger fanned sinks achieve Rths-a around 0.3C/W. Removing the fan will reduce dissipation by at least a factor of ten. If we assume 3C/W then the sink will run at 30Cdegrees above ambient when dissipating 10W. What is your maximum ambient? What insulator are you using between device and sink? What maximum case temperature can you tolerate long term and short term? Yes, it is feasible, but you have a lot of calculating and measuring to do. Are you up to it? Seems you avoid work so far. I have used a CPU cooler to keep power amp driver transistors cool. The main sink heated the drivers rather than cooling them. __________________ regards Andrew T.

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14th June 2006, 01:46 AM	#2
jcx diyAudio Member Join Date: Feb 2003 Location: ..	Has anyone used the Search function before posting? try entering: cpu cooler in the exact phrase box

14th June 2006, 02:53 AM	#3
Duo diyAudio Member Join Date: Jun 2002 Location: Planet Earth	Most of those heatsinks, with fan, will dissipate much more than 100W depending on how hot you want your parts to get. For example, some modern CPUs will dissipate 70W into a heatsink that size. I have used an early pentium heatsink with fan for a 120W amplifier channel and it worked well. The only thing is that you overheat if the fan isn't running.

7th July 2006, 04:58 AM	#6
EWorkshop1708 diyAudio Member Join Date: Nov 2004 Location: Florida	They work fine, but the issue is mounting your devices to them securely.

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