Hey guys. I just recently got a new machine built (3 weeks ago), and up until today all has been well. Today i bought a new video card (which has a lower power draw then my old card) and installed it. Then suddenly, after a few hours, it just shut down and the power button wouldn't respond until I unplugged the power and plugged it back in. Now as I said.....up until the installation of the new card it was great. here are my system specs.

AMD FX-8350
Asus M599X Rev 2.0 Mobo
16 gb of Kingston HyperX ram @1600
Seagate 1tb HDD
New GPU Gigabyte 650gtx Ti oc 2gb. (With 1 6 pin power Connector)
Old card was the Zotac 9800GTX+ 1gb (With 1 8 pin power connector)
Thermaltake Tough power W0104RU bronze PSU @ 650W
Windows 8 Pro

I realized I never uninstalled my old card or the drivers to do a clean install. So when i plugged in my card (and the extra power pin) It just loaded up from what was already on my system. I then got some beta drivers that work with Crysis 3 open beta. Now I realize that it could have been a bad driver conflict. However, i am used to seeing the BSOD or a lock up when a driver conflict occurs. would this be the cause? I did uninstall all of my nvidia stuff and my GFX card and did a squeeky clean install of it. I even looked over my mobo to make sure no caps are going, and it came up clean. I am hoping it solved the issue...but does anyone have any other suggestions on this issue?