Power Mac Upgrade?

So i have read about ever forum post and reply about upgrading a power mac g5 processor. I know its not possible how ever my question is, if you upgrade the logic board then would you be able to upgrade the processor too?

the reason I am asking is be cause a co-worker of mine has a Power Mac with a blown logic board. Apple wants over a $1,000 to replace it but for that price I have found a faster logic board and faster processors.

sounds like a lot of work and a waste of money to me. you did not mention what your friend has in there now or wants but if you can get a Dual 2.5GHz for around $700 or maybe even better i didn't search that hard for prices then it would seem better to buy a box that already has what you want in it.

here is one i found.

you could even get a quad core for less than $1,000 like this.