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Old 6th July 2012, 05:20 AM   #1
Anchan is offline Anchan  United States
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Default CPU Coolers on Ebay: junk or not?

There are a bunch of pretty cheap "passive" CPU heatsinks on ebay, presumably from the far east. Data sheets claiming .2-.4 C/W

Go to Ebay, type in "passive Xeon heatsinks."
This "PreciselyPerfect" one looks interesting:
http://www.ebay.com/itm/Intel-D36871...item20bd3ae5f7

Also, some more here:
Dynatron Corporation - the leading manufacturer of CPU cooling products.
and
American Furukawa, Inc20Thermal Solutions

Attached are a few documents.

Usually CPU coolers have some tricky attachment mechanism making them difficult to use for transistors, but these seem pretty straightforward.

What do you think? Good for our audio purposes or totally bogus? A Xeon processor dissipates more than 100W, so there must be something to them??
Attached Files
File Type: pdf Data_20Sheet_20-_202U_20Intelxae_20Xeon_20Heat_20Sink.pdf (184.4 KB, 24 views)

Last edited by Anchan; 6th July 2012 at 05:24 AM.
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Old 6th July 2012, 05:35 AM   #2
john65b is offline john65b  United States
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I have four copper heatsinks from Xeon CPUs that I was going to use on an F5. Should work fine, but you really need the fan. I bought them for about $9 each.

In a real Xeon, there is a Case Fan right above these copper heatsinks - copper is much better at conduction than aluminum and should "give up the heat" quite nicely with a little airflow......try it out. Put a series 140F thermal switch on it to cut mains power to transformer in case of thermal runaway...
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Old 6th July 2012, 10:56 AM   #3
Anchan is offline Anchan  United States
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Are these the ones you bought?

Xeon Nocona passive heatsink (no fan), 2U 4606

Xeon Nocona passive heatsink (no fan), 2U 4606 | eBay

What does the quality look like once you got them in your hands?

I really can't go wrong for 10$, but there are some other ones on there for 30-50$, and I wonder it its worth it or not to with these 10$ cheapies.
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Old 6th July 2012, 02:07 PM   #4
john65b is offline john65b  United States
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No, mine are about 4"x5" and 2" tall. I can find a

What are you building? Class A? What dissipation are you looking for?
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Old 6th July 2012, 05:40 PM   #5
Anchan is offline Anchan  United States
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Quote:
Originally Posted by john65b View Post
No, mine are about 4"x5" and 2" tall. I can find a

What are you building? Class A? What dissipation are you looking for?
I'm looking to build the L'amp, inspired by Pass' SIT amps which you've probably seen the thread.

Each channel utilizes 2 transistors: one dissipating ~25W and the other ~35W, so dissipating ~60W or so per channel. I am aware of a lot of standard builds of that amp and other Pass amps, but I am looking to build a "compact" version... within reason that is. I am also aware of the usual selection of conventional heat sinks, but these caught my eye.

I am looking to put everything into an old ST-70 chassis. I have a very high quality Vicor switching supply that will fit in the bottom inside the lower part of the chassis. I plan to put the sinks and circuit board on the top part of the chassis, inside the cage, where the tubes and transformers normally go. So basically, I have a 10" X 13" X 4 1/2" tall area to play with.
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