Quote Originally Posted by XtremeTiramisu View Post
Thermalright Ultra120 Extreme (Lapped) vs Ambient Room Temperature

Ambient temp in the room when screen was captured = ~23.2C
As you can see the Idle temp is roughly 11~13C above ambient temp in my room.
So without a doubt, the Thermalright Ultra120 Extreme is the best air cooled heatsink avaliable.
(For similar results, "lapping" the heatsink base is strongly recommended )
You worked out the chip is using approximately 210W, right? Having a look around the 'extreme' with a good fan mounted correctly could have thermal resistance of up to 0.1 C/W. Assuming its mounted well, then a fairly accurate way of confirming real world temps is to work out the delta.

So the temperature delta for that HSF and cpu is 0.1 x 210 = 21C at load, 13C at idle seems reasonable. I assume its in a case, or is the room ambient the same as the air moving over the HSF, i.e. case temps?

Just add the case/room temp to the delta for Tc. So 21+23.2 = 43.2C The core temp is higher, opinions vary, maybe +10C. Gives an approximate junction temperature of 53C.