Pentium Heatsink/Fan for B&W G3

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Hi all... I've just bought a 450 G4 Zif from daystar for my B&W G3. I currently have it running at 550 mhz and all seems fine. I did try it at 600 mhz and it seemed fine for a while but it hung when importing a cd into itunes. Im guessing this is as it overheated? Anyway, before I try it again at 600 I thought I would attach a Pentium or AMD heatsink/fan to it and use some Arctic Silver. Does anybody know of any that fit pretty much straight on or have tried it themselves? I read somewhere on xlr8yourmac.com that you can use a Volcano 6 but you have to bend the clips and modify it a bit I think. I also read that a radioshack one will fit straight on but as I live in the UK this isnt an option. Any suggestions? Thanks

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Joined: Apr 11 2005
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So has no one managed to find

So has no one managed to find a pentium type heatsink that fits straight on using the original apple clip? Im sure someone must have managed to do it before!! I just need an idea of which one to go for before I buy it, or at least which pentium socket type (A, 478 etc.) is the closest fit. Thanks

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Jon
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While a new heatsink might ha

While a new heatsink might have advantages, the old one was designed to be there. You might try the arctic silver w/ the old HS and attach a small fan (40mm? Maybe a 60mm would be too big) to it to get direct air movement. THen you are guananteed that it is making contact witht eh CPU, and you have active cooling.

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Arctic silver is a waste of m

Arctic silver is a waste of money. When properly applied (and almost nobody does) it has a thermal resistance of .28°C/W while common whit grease has a thermal resistance of .32°C/W. (test done on a 1"^2 heating block)

Hardly worth the expense.

I'd add a fan to the existing heatsink. The normal extruded aluminum is plenty good for any power level you are going to get out of the G3. Finally, it's probably not failing due to heat if you can comfortably touch the heatsink.

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Dr. Bob
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Re: Arctic silver is a waste of m

drbob wrote:

Finally, it's probably not failing due to heat if you can comfortably touch the heatsink.

While that is true, if the heatsink isn't warm at all, you might have a contact problem, and need to reseat the heatsink to ensure maximum heat transfer.

Cheers,

The Czar

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In that case, the machine rar

In that case, the machine rarely finishes booting. The only time I've seen that happen and still be semi workable was when someone used WAY too much thermal grease and it worked as a gap filler (it did evetually fry the processor).

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Dr. Bob
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did anyone ever find an alter

did anyone ever find an alternative heatsink that fits, or knows the pentium equivalent size for the mounts?

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Pentium Heatsink, B&W

The thing you are going to have to watch out for is that the stock heatsink has some of the fins shortened, so it will clear the bottom 3.5" bay. You might just have to do the same shortening on a Socket 370 heatsink.

I would concur with the fan idea; a smallish unit, and you could connect it to the bit that isnt shortened.

In short, I don't have a Socket 370 heatsink on hand; but besides watching out for the clearance on that bay (there's usually a Zip in there, if anything) I think it's plenty doable.

-- Macinjosh

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Hmm...

I replaced the heatsink on my B&W some time ago just because I could. I used a 1U, very short, socket 370 heatsink and fan combo for the job. To make it fit without hitting something I had to take off the fan on it, though.

I think I either used the original clip that came with the G3 or I bent another one into shape. I forget now.

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I did manage to find a small

I did manage to find a small heatsink that fits, just the clips are too long. Really I wanted to find something that uses all 3 clips on the socket, like the newer style heatsinks with the lever. I think newertech did something years ago on one of the heatsinks on their upgrades. I just find the orignal clip useless by the time you have bent it off and back on again as the heatsink doesnt seem to be as tight on as it could be.