Yep it's all good. So your CPU, IMC and RAM should be stable. If you get a freeze in a game now, it could have to do with the graphics card heating up the system and causing problems elsewhere.
When i look at your CPU, board and RAM, then the graphics card surely is a high-end model too with a big power consumption (and therefore heat production). RAM is temperature-sensitive.
If you can reproduce the freeze after 20-30 mins for example, then you could do a test like leaving the side panel open and pointing a big household fan at the board.
When you don't get any freezes then, it means it would be temperature-related somehow.