It was pretty damn easy I must say. Geekbench before and after scores below. Lil backstory. I had a decked out MacPro3,1 (geekbench of 12500) and I needed some more PCIe 2.0 slots, and a little faster video editing speeds. So MP4,1 was best way to go with budget (came across a good 4,1 body) Did the update - easy as pie. Grabbed a @W3690 off of ebay, and just threw it in this baby. There are youtube links out there that show the process from start to finish. Again, real easy. Anyway, I upgraded a 4,1 2.66 ghz 8gb of 1066 ram --> flashed it to 5,1. Got a W3690, threw 24gb of 1333z ram in it. Reset my pram, and I was off to go. Here are my geekbench 3 @ 64bit scores before: And here they are after the upgrade. Very happy now. I got an extra velocity x2 solo card (i already had one) I am using a 480gb OWC 6g ssd as my video scratch disk. And two 120gb striped 6g SSd's on the other x2solo as my boot drive. This puppy feels a lot faster than my macpro3,1. And I have an improved setup for my video editing purposes at this time. I still have my eye on a new MP when I get the budget for it. But for right now, I think this will do. Thanks.