Hello All, I have just bought a second hand Mac pro 4.1, its in great shape with the following spec. 1 * 2.6gz 4 core 7GB ram in 1GB + 3 * 2GB 640GB HD + 2 * 1TB HD Nvidia GT120 What would you guys recommend I upgrade first? I have heard about doing a firmware upgrade to a 5.1, but I take it I need a W3565 or could I use a single E5645/X5675? I have some registered ECC 4GB PC3 1333 DIMMS would these work or do I need normal unregistered ram? I have a 160GB SSD as well, but no mountain lion DVD, so looks like I will have to buy the OS if I want to install it on the SSD. I havn't got a keyboard and mouse yet, I was thinking of a Magic mouse. I also thought I could sell the graphics card and maybe buy a normal HD5870 and flash it, does anybody have a guide on how to do this? What can I run to test the stability? ---------- Do dual cpu socket logic boards ever turn up cheaply? I didn't realize there was a single and double socket option.