Firstly, I think the card is safe upto 80c, so keep it below 70c and your good

Mine running Furmark (max temp load) gets to around 66c fully loaded.
Secondly, if you have done as I suggested, created two Profiles...
Profile 1 = Cards Default speeds.
Profile 2 = OC speeds.
Then go into the Settings of MSI and look under the profile Tab... you can set the 2D to your cards Defaults, and the 3D to your OC settings, then simply load and apply Profile 1, the set MSI to load on Startup...
Each time your system boots, MSI will load Profile 1 by default and when you run a game it should automatically load Profile 2.... and when you exit the game, MSI will revert back to Profile 1 again, job done