I currently have a ASUS M5A99FX Pro R2.0 MOtherbooard with 16GB of Ripjaws X @ 1866Mhz, a EVGA 9800Gt GPU x2 in SLI, Samsung 840 Pro 256GB x2 in Raid 0, and a Phenom 2 x4 945 CPU cooled by a Corsair H60 in push/pull. Ive been in the process of upgrading for about a month and a half now. I finally got my new CPU in today which is a AMD FX-8350. In the past I have upgreded few CPUs with no problem. However, those upgrades were minimal or maxing out the Mobo's CPU support and usually staying within the same Architecture of CPU. I have never upgraded from one platform to another. Example from Phenom to FX. My question is will it be necessary or even recommended to reformat and re-install Windows . Its not a big deal to do and doesnt take that long but I literally just re-installed about 2 weeks ago when I got in my SSDs. Any help/advice would be greatly appreciated,, Thanks in advance. ~Odizl