Anyone know of an alternative heatsink that will bolt straight onto the B&W G3 motherbaord using the existing mounting? I have dug out my old B&W G3 with a G4 upgrade and need to get more out of it!

I replaced mine with a funky blue one (it was the same size though) and bolted a fan on top. DIdn't help much with the overclock though.

Did you use the existing clip? I really want to replace the clip with one that uses the lever type system so its held on properly. That flimsy clip doesnt seem to hold on the heatsink as well as it could.

I either used the original clip or a very similar one. It took alot of re-bending as I recall.

I picked up a heatsink meant for a 1st gen G4 for my old proc (now zen's). It can dissipate more heat and has the cut for the G3 case. How fast of a proc are you using? That can affect which one you eventually use.

My funky blue HS came from an old Cyrix x86 box. FYI.

I used a PC Socket7/SocketA Heatsink with out the fan and trimmed some fins off so it cleared the center rail (Where power supply and CD-ROM cage sits on) so the case can close. I even attached two fans on each side to help things out. I used a level clip to hold the heatsink on. I had to cut it down and bend it. Hard part was drilling a hole big enough that it would clip on.

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 and again when running a Quake III test. 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. Also, which Pentium design fits best (Socket A, 478 etc...)? I would prefer to buy one that I can just use the standard heatsink clip with and bolt it straight on.

Heres a thought, what about just attaching a fan to the original heat sink? If you pull one from any random pc you could probably thread the screw right down between the fins. I did basically that wit a PS# that was overheating and it seemed to work.

When I had my Powermac G3 with the PowerLogix 1 GHZ G3 Upgrade running at 1.1 GHZ, I had the REV B heat sink with a fan from a 486 heat sink screwed to the top of it. It ran very stable at at this speed. So, I agree with RadioC1ash, that adding a fan to your current heat sink is a good option.