I recently got an RTX3090, and it has made my machine very unstable (ROG Zenith Extreme, Ryzen Threadripper 1900X, 32 GB RAM, 512 GB SSD, previously Titan Xp). Haven't received it yet, but I can say that my old rig (9700k, blah, blah, with Corsair 850w PSU) ran the 3090 just fine. I had to pay for cross shipping but the CSR said "they'd most likely bump up the replacement PSU to a "1000W 'Plus' " model (I assume he meant a 1000 G+ PSU). I finally called EVGA support and after explaining my setup and what I'd tested so far, the customer service representative (CSR) said that the GA line of PSUs has a known issue with Nvidia 3000 series GPUs and they would RMA it. Lowering settings to medium and disabling ray tracing & DLSS increased the up time but it would eventually still power off. The results were the same: AIDA64 was rock solid under stress, TimeSpy and Port Royal were rock solid, old games were fine, Control and Watch Dogs Legion always caused the system to power off. Played with memory timings, stock settings, disabling CPU boost settings ,etc. I spent the entire weekend troubleshooting my new rig (5800x, H115i Platinum, Asus TUF Pro x570, 32GB C16 3600, 3090 FE w/o OC, EVGA GA 850). While EVGA is supposed to provide me with an upgraded replacement PSU, it would've been cheaper (considering shipping costs) to buy PSU that is confirmed to work with a 3080/3090 in the first place. They will agree to replace the PSU because it's a known issue for them.
TL DR: the GA line of EVGA power supplies can't run Nvidia 3000 series cards, confirmed with EVGA support.
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