I have four questions about processors and RAM upgrades for my old Mac Pro 1,1 1) If I choose to buy quad core 3GHz replacements, instead of the cheaper quad core 2.66GHzs, should I be concerned about how to cool the processors? what about firmware? 2) The RAM I will buy will be either one of the following from "Nemix", but I cannot make a decision! Please help! $54.28 (+2 year warrantee for $4.74) $59.02 8GB (4X2GB) APPLE MAC PRO MEMORY ECC FULLY BUFFERED DDR2 667 PC2-5300 FB DIMM NEMIX RAM http://www.amazon.com/o/ASIN/B006E2Q64C/ref=nosim/betteraddons-20 $59.99 (+2 year warrantee for $4.74) $59.02 8GB (2X4GB) NEMIX RAM Certified Memory for APPLE MAC PRO 2006-2007 1,1 2,1 MA356LL/A A1186 (DDR2 667MHz FBDIMM FULLY BUFFERED) http://www.amazon.com/o/ASIN/B0085MH238/ref=nosim/betteraddons-20 3) Does a "matched" pair of RAM also need to match all the other pairs of RAM in the computer? Or just in each pair per riser? 4) There are plenty of places to buy RAM for this Mac, but in regards to processor shopping, it seems like slim pickins, and I don't trust most of the sources on Ebay,. etc. to provide me with some quality, matching 3GHz processors at a good price So where should I look?