Vega 56 only working with crappy PSU
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Solved by Zando_,
Vega cards are known for massive transient spikes (giant wattage spikes for a couple milliseconds). Your nice unit probably isn't set up to account for these if it's an older design, so it trips OCP/OPP and shuts off the PSU. Lots of good units had this issue when the Vega cards released, no mark against their quality just the OCP/OPP settings had to be updated, and have been on all the newer refreshes. The crappy unit likely does not care and is just allowing the GPU to do whatever it wants.
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