You're running your PC in a hotbox and expecting it to cool properly?
Err, maybe. It's never been an issue before, well, except once, when I took my Skylake G4400 @ 4.x Ghz, and put BOTH of my HIS 7950 (those used two PCI-E power cables... each), into ONE PC, and tried to run it in the cubby. It would run if I pulled it out of the cubby, though really warm.
I pulled it out of the cubby, only running 12 threads of PrimeGrid on the CPU, manual OC of 4000Mhz @ 1.365V, and initially, in the cubby, it skyrocketed to 105C right off. Pulled the PC out of the cubby (sides off, btw), and now it's cooled off to 98C.
What I found interesting to note was, the heatsink (Gammaxx 400) wasn't hot. Maybe, just very mildly warm. I've felt my CoolerMaster TX2 heatpipe heatsinks on my Core2/Core2Quad rigs, after running DC on an overclocked, 100W+ Core2-era CPU, and it felt... pretty darn warm.
This one, does not. Which makes me wonder, did I get a bad TIM application under the heatspreader? (I don't know for a fact, but it wouldn't surprise me if maybe 3600 was TIM, and higher CPUs were solder.)
Or perhaps, my sensors are indeed borked.
My K-A-W gives around ~450W power at the wall, with 12 threads doing PrimeGrid, and 2x RX 570 cards "mining".
Edit: Is there a software out there that works with 3rd-Gen Ryzen, and will give my Tctrl, or distance to thermal throttling / PROCHOT? That might be illuminating.
So I found this, and downloaded HWInfo:
Edit: The ends of the heatpipes feel a little bit warm, the fins don't, but I guess that they wouldn't.
It's a little disappointed, to find out that HWInfo agrees with HWMonitor and Ryzen Master. I thought for sure, possibly, it would indicate that the temp sensors are borked, but I guess not? So, that means, I have bad TIM/interface contacts between die and heatspreader? Are delidding kits going to be a thing for 3rd-Gen Ryzen? Or should I try to RMA? (I've already overclocked. I don't think that I would feel comfortable doing that. Maybe an upgrade to a higher-end 3rd-Gen in a couple of months, to get something better-binned.)