I bought the the 2010 Mac Pro after much debating on whether to build a hackintosh or not. I bought the low end model from B&H Photo given it was the best price for the low end model and secondly knowing that I would be upgrading it. I bought the W3680 3.33 GHz westmere from an eBay seller for $899 plus shipping. This was cheaper than either the 980x non xeon version or the Newegg w3680 (or most other site prices for the w3680) which seems hard to find. Overall, even if I could not sell the 2.8GHz w3530 xeon which came with the machine I would be out $899 vs $1200 plus tax from Apple (about a $400 outright saving). In order to upgrade, I followed the pictures from Anandtech's guide to get an idea of what I was looking at and then started: 1) http://www.anandtech.com/show/2800/10 This is for the dual processor board but the single processor is similar. Secondly, the current Mac Pros come with the heat spreader. 2) Open the Mac Pro up and remove the processor board. 3) Pull the heat sink off. I bought a 3mm --- 9in hex tool from Grainger (you will need this or something similar. There are 5 screws to loosen that spring loaded. 4) Ground yourself touching the mac pro case. Pull the lever around the processor and pull off carefully -- do not touch the underside of either the processor or the processor socket. 5) Place the new processor and pull down the lever. 6) Apply a few drops of thermal grease like arctic silver on top of the processor. 7) Refasten the heat sink -- but dont overtighten as the screws that you apply the hex wrench to are spring loaded. As soon as feel hard resistance -- stop. After that restart the Mac Pro and you should see the new processor speed listed under Finder under 'About a Mac'. Depending on the memory that came with your mac -- it should automatically uptick to 1333mhz speed. Similarly, I bought memory at Superbiiz for the Mac for 291 delivered for 12 gb. Overall, this saved money but as always changing processors (especially expensive ones) are always a little scary if that is not what you do frequently. For me, I wanted to take the risk. If the process sells on ebay, I saved myself at least $650 on the processor and at least $40 (vs OWC memory prices. Feel free to ask questions if you are considering this process -- the threads on this board and Anandtech have been very helpful to me so I thought I would share a little of my experience.