Hi all, New here but have been reading for a while I recently bought a late 2008 quad 2.8Ghz Mac Pro V 3,1 and during the setup discovered that it had a second empty processor slot. I found that Apple wanted around £760 for the processor and about £180 for the matching heat-sink .... OUCH ! So I researched the correct Intel Xeon chip ( 5462 ) and picked up a used but working one from Ebay for £129 My local Apple repair centre could not supply the Heat-sink, as I had not bought the processor from them ... so I had to find one and eventually got one from VIZ in the UK. I found a service manual on-line and went through the procedure yesterday. I took my time and completed it in about 1.5 hours, I really couldn't have done it without the tips and photo's from the service manual ! The hardest thing was getting to the damm heat-sink hex bolts. which are buried over 10cm down through very tight access, even with most of the Mac in pieces on the floor ! Anyway, got it done and it worked on first boot Just wanted to share my success and "joy" at managing to NOT screw my 'puter and ending up with a very reasonable cost "monster" machine. cheers, Marty.