^^ you've answered my question - do you have gfx card installed in your system as reltemp is showing gpu temp of 54c - what gfx card is that ??
As you are going to OC it with that psu it's very important to know about the gpu.
Are you using the stcok HSF ??
If you want to get the real load temp of your cpu then run orthos/prime 95 for 1 hour ( cpu and mem stress test ) and run real temp side by side and watch those temps and post screenshot.
Run a realtemp sensor test and post the temps with screenshot.
BTW, which game you've played for 1 hour to test your cpu temps ??
I've cleaned the surface of the cpu and the bottom of heatsink with clean dry cloth properly but never faced any temp issue
