Overclocker der8auer is contending that X299 boards have bad VRM coolers: temperatures reached as high as 100C on the board he tested. He estimates that the VRM modules are probably at Tjunction max, and the single 8-pin connectors on PSUs can hit 60C when overclocking the 10-core models. “If I take off the heat sink and just put a fan over it, there’s no problem whatsoever.”
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Source: [H]ardOCP – X299 VRM Coolers Are Being Described as a “Disaster”