RX Vega 64 Draws 200 Watts, Then Throttles To 40 Watts At Load.

[BuckyJunior]

Hi there, everyone. I am posting about the same issue related to my RX Vega/Pro Duo cards again, so I apologize. I now have some more information about what the issue may be. I had bad memory, which G.Skill replaced, though it took forever to receive the replacement. Anyway, my GPUs still do not perform the way they should. When running games and benchmark tests such as Unigen Heaven or FurMark, my GPU starts at drawing 200 watts, which, if I am correct, is a bit low for Vega and Fiji, especially at 100% load. Then, over time, the wattage drops, and starts throttling down lower and lower. When mining, as time goes on, the power consumption falls, and so does the hashrate of the cards. I have already tried using a different PSU, a 1600W EVGA SuperNOVA, identical to the one I built my system with, each sharing the same issue. Would it be possible that I need a 20A circuit?

Specs:
AMD Ryzen Theadripper 1920X
RX Vega 62 x2
Radeon Pro Duo (Fiji) x2
1600W EVGA SuperNOVA
32GB G.Skill Memory @ 3200MHz

 

[TJ Hooker]

What temperatures are the cards reaching under load?

Doubt you'd need a 20A breaker. Even the normal 15A would allow for more than your PSU is rated for (1800W, assuming 120V mains).