I had a Powermac 7300 that I upgraded to a Sonnet G3 400mhz years ago where I got both the machine and the processor from ebay (2 separate auctions months apart), and I haven't had any issues with either one. In May of 2005 I purchased a G4 Digital Audio 733mhz. No problems there either, but as I got around to some games I wanted an upgrade, so I bought a Sonnet 1.2 Ghz upgrade, and I've had no problems with it either. True, both of the upgrades didn't come with a warranty, or maybe it did and I didn't bother noticing. I just never had a problem with Sonnet upgrades (since there's no messing around with jumper cables and such on the upgrade) and they've been rock solid. The ebay feedback speaks for itself, but don't hesitate to check the manufacturer's website, or even past ebay auctions (site map, completed listings) to see what people have been buying and saying. Eric Judy Antipin wrote: > I apologize if I've missed a similar discussion recently - haven't > been able to keep up with mailing list email for a while. > > I'm considering a processor upgrade for my quicksilver 2000 G4 933 > mhz. I've been looking on ebay and see offers for new with warranty > > > Giga Designs 1.8GHz G4 Processor Upgrade for AGP for about $289.00 > and same 1.6 GHz uprades for about $259.00. > > > I'm also seeing used 1.4 GHz OWC Mercury Extreme upgrades for much > less - like under $100 - these are being offered by reputable power > sellers who state that unit has been 'pulled' from working G4 - give > you 10 days to return as defective but no warranty. > > Any comments on value of these appreciated. Not sure if 933 to 1.4 > would even provide much of a bump. > > > Judy Antipin -- Eric Buczynski emaxxx4 at warpmail.net