never seen the MSI software before, I believe it is just a set of preset overclocks that you can choose.
Slide the sliders and run a benchmark, it's trial and error really until you find a stable overclock. Nice card btw
Those cpu temps are incorrect, you need Real Temp or Core temp (Core Temp will need to be calibrated to use TjMax of 95°C)
EDIT: Yesssss, those little cubbyholes in desks are notoriously bad for air flow, I've even seen people cut out holes and mount 120mm fans to exhaust the hot air from them.