I have several G3 blue and white towers, and I got the idea to take a heatgun and desolder the 750fx cpu from an ibook motherboard and the 233mhz cpu from the zif cpu, and put the 700mhz fx cpu in the zif board. Would it work? I would be putting a 750fx cpu in place of a gx I think, but I'm not sure of what it is, if it matters.
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If you have experience in doing that kind of work, you might be able to do it, but i'm not sure if the 750fx is pin compatible with a gx. if you have a surplus though, all you will loose is the iBook motherboard and a zif card. So go forth and soldier!
I wanted to try something like that but, how do you unsolder the CPU without damaging it?
One should be able to use a heatgun to melt the solder on the pins of the CPU, then lift the CPU off the board with some tweezers. That's what the company Friendtech did to upgrade the Xbox CPU to a 1.4ghz celeron from a 733mhz.
Search the forum and Google for "BGA", aka "Ball Grid Array". All G3 CPUs use this packaging format, in which the CPU has no "pins", but instead is basically welded in place by preformed solder-balls which are put on the part at the factory. It's basically impossible to remove and replace these without special equipment.
You can certainly get the CPU off the board with a heat gun, but if you intend to reuse a BGA part it needs to be "re-balled", and then attaching it to the new board is a nontrivial problem.
--Peace
That's not what I wanted to hear.
Oh well.
Plus the fact that the B&W towers use a 750, not a 750gx. AFAIK the 750fx and 750gx are pin compatible, but not with the 750.
Also, the 750gx is newer than the 750fx... and has twice as much L2 cache. So you'd probably upgrade from a 'fx to a 'gx rather than the other way round
TOM