PowerMac 604e/250 processor for a Cyberstorm MK3 ???

[x56h34]

603e and 604e chips sit on small tiny balls of solder (please don't twist this into a joke). ;-)
There's no pins on the CPU that go through the PCB at all. Even the 68k CPU's pins on CSMK3/CSPPC don't go through the entire PCB (this only applies to CSMK3 and CSPPC though). That's why both CPUs on CSMK3 and PPC are very, very, VERY fragile, and should not be pressed down on, never, ever, EVER!

At one time, there was a 160Mhz 603e chip that had pins and was soldered and in fact looked similar to the SCSI chip (on BPPC) which was more "damage resistant" than the next generation which used bubble soldering afterwards.

[Karlos]

If you *absolutely* know what you are doing, you can replace BGA surface mounted parts quite easily. If you don't know what you are doing, forget it immediately.

You need to heat the chip to the melting point of the solder (the BGA solder melts a relatively low temperature) with a heat gun (and a properly focused nozzle) - which should literally take seconds. The solder melts and the chip is then held by surface tension effects only and can be lifted clean off.

The new chip needs to be positioned as exactly as possible over the pads and heated in a similar fashion. When the solder melts, the surface tension pulls the chip into complete alignment anyway (one of the cool side effects of BGA).

However, unless you had any experience in doing this I suggest you forget it completely.