OP here. I wish I had! Unfortunately that's my work machine and I don't have the time to somehow get my hands on a new fairly rare, very expensive motherboard, disassemble my workstation and rebuild it just to see if my motherboard is the culprit. From the experience of other owners of the 3970X, this problem happens with other TRX40 motherboards.
At least EU Amazon is extremely good about RMAs, e.g. international expresses delivery (next day) even without returning the defective component 1st. Return shipment is also covered, i.e. free for the customer.
Dunno, if they'd do that for high priced stuff, though.
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