You can very safely say those temps are reported wrongly Achim; the RD790 chip and motherboard temp sensors is reading minimum 20C too high if your ambient is 20-24C. Those core temps readings are actually at 53C minus 30C offset as shown in the CPU diode label taken from the socket.
So it's 53/4C EVEREST continuous load that made your CPU dead? Mine would not boot 52C EVEREST..
Which means, those 53C readings are most likely ~63-68C IMO. By my calcs, 22C ambient, it shows 20C per core, adding minimum 12C idle at 130W TDP and you would get 50C load readings when its at 60-62C actual (approx).
Although your core temps read close to actual, they didn't do so out of internal feedback accuracy but out of another error: high BIOS offsets for all system temperatures.
Woe, are you sure it's the CPU and not your board that's dead? Tried in another board or another CPU in this board yet (your BE)?
Leave it for a a day or two or I suggest put the chip under some cold if you can. See if it fires back up with nothing connected but one RAM stick.
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