The dual 2.7ghz i bought works to some degree. I soaked both processor cards in vinegar, then water, then alcohol. Processor 0 seems to be working normally. Processor 1 is reporting erratic and often negative temp numbers and the computer freezes after about 3 minutes and has to be force powered off. I put processor 1 back in the vinegar and will repeat the process hoping to get it working again. I am unsure if the logic board is totally working either, some of the fan speeds dont make sense.
I tried putting the 2.7ghz processors in the 1.8ghz board and the 1.8ghz in the 2.7 board. Both times resulted in power on but black screen and no bong. Putting one 1.8 and one 2.7 in each board resulted in the same black screen no bong. A single processor in the 2.7 logic board will not even power on where a single processor in the 1.8 board will boot normally. These are not the results i expected, it seems like an insane amount of effort put into preventing any kind of processor swapping that just doesnt seem to exist in any other apple product. I cant think of a single other mac that went so far to prevent processor swapping. I would have expected the 2.7 board to boot with the 1.8ghz processors. And programming the 2.7 not to power on with only a single processor seems weird but i guess makes sense because both processors were attached to a single cooling unit and cant be removed separately, so if only one shows up somethings not right. But why bother wasting the programming resources to do that.
If i can get both 2.7 processors and the board to work properly and not crash i will put them in the plywood G5. If i cant i will box up the parts and look for another doner. Even if the processors and logic board all turn out to be bad at least i got a working radeon 9650 and 2gb of ram for my 25 bucks so im happy no matter what.