gx mode is disabled. i got this response from evga forum
TDR's are not always caused by GPU drivers or bad gpu's.
They can also becaused by bad network drivers, sound drivers, ide drivers, sata drivers blah blah blah.
If the issue is resolved by changing the surround mode, then the sound driver is causing excessive ISRs to the point that it delays the video driver's response. makes sense thats why i started using the dolby mode in the first place. default 5.1 mode with dolby off would cause a studder / audio lag that sound kind of like a burp through the speakers. using dolby mode fixed that problem.