what happens when you use an intensive OpenGL app? XBMC in windowed mode is a 
good place to start, since you can minimize it and watch your heat, or rather 
anything using windowed mode+OpenGL at any larger scale. you can watch your 
heat with this (it's what I have in conky lol):
nvidia-settings -query GPUCoreTemp | grep Attribute | grep -o '[0-9]\{2,3\}'
after a minute or so I'm up to 90+°C and after a few minutes I end up over 100°C
I'm using XBMC in windowed/maximized mode and a desktop resolution of 
1920×1080@60Hz with DynaimcTwinView disabled (I use grandr to resize, with 
DynamicTwinView enabled, XBMC fails to get an output list and I end up with 
massive stutters)

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to nvidia-graphics-drivers in Ubuntu.
https://bugs.launchpad.net/bugs/882710

Title:
  Monitor(s) black out and session freezes.  "NVRM: GPU at 0000:01:00.0
  has fallen off the bus."

To manage notifications about this bug go to:
https://bugs.launchpad.net/unity/+bug/882710/+subscriptions

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