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View Full Version : Mac Pro Memory: A Hot topic - Part III


MacBytes
Oct 25, 2006, 04:53 PM
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Category: Apple Hardware
Link: Mac Pro Memory: A Hot topic - Part III (http://www.macbytes.com/link.php?sid=20061025175315)
Description:: Why we do not need such big heatsink

Posted on MacBytes.com (http://www.macbytes.com)
Approved by Mudbug

Nermal
Oct 26, 2006, 12:04 AM
I'm confused.

On the top is the Apple original FB-DIMM module (Samsung), and on the bottom is the Dane-Elec module with its smaller heatsink.

http://files.macbidouille.com/news/200610/2RAM.jpg

http://files.macbidouille.com/news/200610/cartmem.jpg

Is it just me, or do the Samsung heatsinks look much smaller than the Dane-Elec ones?

arn
Oct 26, 2006, 12:10 AM
I'm confused.

http://files.macbidouille.com/news/200610/cartmem.jpg

Is it just me, or do the Samsung heatsinks look much smaller than the Dane-Elec ones?

I think the ones on the top of this pic are the DaneElec.

But it didn't really seem like real scientific testing here... they just ran it with the smaller chips and didn't run into any obvious problems.

arn

CanadaRAM
Oct 26, 2006, 12:31 AM
Barefeats.com was pretty thorough, and they concluded that a properly designed (thick metal as opposed to thin pressed steel) flat heatsink performed just as well as Apple's memory. A finned heatsink was cooler, but all were way below the temperature maximums.

Just because the module has a massive heatsink, it doesn't mean the heat is effectively conducted away from the chips. The heatsink has to be manufactured to precisely fit on the chips and make contact with them over as large a flat surface as possible. If a large finned heatsink is poorly made or poorly assembled, (as has been reported in another thread with the Maxupgrades RAM) then the RAM will have problems.

I would in NO way recommend replacing the stock heatsink on RAM with a third party finned heatsink.
1) You would be voiding the warranty on the RAM by removing the stock heatsink, and
2) The heatsink has to mate with the RAM chips. Different companies RAM have different sizes, thicknesses and physical arrangements of chips. As do 1 Gb and 2 Gb modules even of the same brand (one of our manufacturers makes three separate heatsinks, one each for their 512, 1Gb and 2 Gb FBDIMMs, with different topologies on the undersides). The chances of a generic third party heatsink mating effectively with all the chips on any given RAM module are slim. Again - it will look impressive but be thermally ineffective.

Thanks
Trevor
CanadaRAM.com

Nermal
Oct 26, 2006, 06:13 AM
I think the ones on the top of this pic are the DaneElec.

In the first pic, the silver ones clearly say Samsung on them.

eric67
Oct 26, 2006, 07:23 AM
I think the ones on the top of this pic are the DaneElec.

But it didn't really seem like real scientific testing here... they just ran it with the smaller chips and didn't run into any obvious problems.

arn
SORRY

It was a typo mistake I have made. it is indeed a Dan-elec on the top and the original Apple modules on the bottom (this time with black heatsink but they also exist with silver-colored heatsink)
Samsung labelled simply indicated that Dane-Elec has been using Samsung memory chips. as many RAM manufacturer, Dane-Elec does not produce the chips (silicon), it assembles chips on the PCB.

concerning the "didn't really seem like real scientific testing here" my dear Arn, we have started recording the temperature via a laser-based thermometer, but it failed in the middle of the test week. So we relied on Hardware Monitor application that was run in parallel as a backup and has proven since months to be accurate and reliable to monitor hardware.
:)