I currently have a 2011 MBP and I use it for OS X but recently I was given (yes given) a 2006 Mac Pro as my company were upgrading their music department line of Macs. I decided I wouldn't really bother with the mac side and just use it as a backup for my MBP and I would just give it a 1TB HDD and whenever Mountain Lion comes out, I found a method to forcibly install it. Please tell me this method works: http://www.j4mie.co.uk/blog/2012/02/18/how-to-install-mountain-lion-on-macpro11/ I decided that I was going to use it primarily as my windows machine. I upgraded it to 16GB RAM and planning to get a cheap SSD (The new Crucial V4 SATA 2 line should do nicely) My dilemma begins with the widows 64bit install. I have retail windows 7 64 bit and I read that I have to have a patched install disk for 64 bit on the 1,1 model. I plan to follow this guide: http://www.gopulls.com/blog/2009.08.26/install-windows-7-x64-on-a-mac-beat-the-select-cd-rom-boot-type-error/ And then use the snow leopard disk to get 64 bit bootcamp drivers (yes I know I have to use CMD and navigate my way to the .msi) This should work, right? My final, and arguably most difficult to solve dilemma is the graphics card. I plan to leave the 7300GT that was in there originally for the mac side and to get EFI Bootscreen. My question here is if there is a cheap upgrade to the 7300 that works with the 1,1 and allows for bootscreen? I plan to stick in a GTX 670 into the second slot. This is what I'm worried about. I hear that if I have both the mac graphics drivers and the 670 drivers installed in windows it should be fine. If the PSU is not enough, I can stick a small PSU into the 2nd superdrive bay. Any suggestions or glaring mistakes here? Can I get the GTX 670 running on the windows side (not worried about it working on the mac side) and will the other old card allow me to access boot screen and boot into mac at the same time? P.S I understand my 2x 2.66 dual xeons may be a bottleneck but a friend of mine says he may have a couple of the xeon 5355 2.66 quads lying around that I understand my 1,1 can upgrade to. Will this be a good upgrade?