Bsod:116 While in games.

So my PSU blew up a few weeks ago after updating the bios on my P8P67 Deluxe. I got a new PSU Rosewill Xtreme Series RX850-S-B 850W. Hooked everything up and PC boots right up. Installed a new Asus Xonar DS sound card at the same time as well. Everything is working fine except while in games (Mainly BF3) my screen goes black, fan on the video card speeds up and I have to restart my pc. Get back to the desktop and get the error code for Bsod:116. I had a MSI gtx460 cyclone so I used Kombustor to stress test and it would only crash when I ran 1920x1080 with AA on (8x). So i thought ok it is my video card I wanted a new one anyways.

Just purchased an MSI GTX660TI 3GB hook everything up with no issues. Now both BF3 and Assassins Creed 3 give me the same Bsod:116.

i5 2500k@4.5ghz (prime95 overnight stable max temp 70c)
Ran all tests at stock speeds no OC with same issue.
P8P67 Dexlue Bios 3602
Gskill Ripjaws 2x4gb 1.5v 8-8-8-24 2t
120gb OCZ Vertex 3
Asus Xonar DS
Rosewill Xtreme Series RX850-S-B 850W

Prime95 stable with our without OC. Memtest+86 4.20 overnight no errors. Reinstalled Windows 7 pro same issues. Tried multiple Nvidia drivers no fix.

I put the video card in my second PCIe slot and have not had any issues. I thought it also ran @16x but it only will run 8x. I am leaning towards a bad Main PCIe slot but I don't understand why it would work sometimes and only crash in intensive games. (Never had an issue on desktop or internet browsing, video, music etc.

Line of Text from BlueScreenViewer
011613-6879-01.dmp
1/16/2013 9:11:49 PM
0x00000116
fffffa80`0b2644e0
fffff880`0ff1d630
ffffffff`c000009a
00000000`00000004
dxgkrnl.sys
dxgkrnl.sys+5d000
x64
ntoskrnl.exe+7efc0
C:\Windows\MiniDump\011613-6879-01.dmp 4
15 7601 576,192

Please Help.