pastrychef
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ok, pretty new to all this so no idea where I would find the thermal paste?
Any ideas if it would be related to the 750w psu?
Power supply is certainly a possibility... However, I think 750W is more than sufficient for a Vega 64 and i7-8700K unless both of those are extremely overclocked or if you have lots of internal devices installed.
If you suspect it's the power supply, you can use a multimeter to test the 12v rail when under load to see if it's actually providing 12v. Connect the multimeter to a 4 pin Molex connector to test. Yellow is 12v and black is ground.
Here's a pretty good video on how to replace thermal compound:
I've grown to really like Thermal Grizzly Kryonaut.