D3D Hung Graphics Card

[AirSimulator]

Just triple checking, I have an Asrock RX 6950XT OC Formula that is undervolted -85mv with a -10% power limit, a 5600x3d, and an EVGA GA Supernova 750 W power supply, but unless I frame rate limit the games, the latest games will crash with a Hung GPU / Lost graphics device error. Have had the issue on Hellblade 1, BG3, SW Fallen Order. Running the graphics card at default voltages and power limit gives the same result. Should I be upgrading to a 1000W A-rated power supply, or is the graphics card just busted? For context, I have done driver updates, tried removing Radeon adrenaline software and just gone with the driver, and I believe I lengthened the time out time before the game crashes using a registry edit, but nothing has helped. Also have done long term FurMark and OCCT stress tests which go fine. Typical output at default voltage in FurMark is 600W based on my CyberPower UPS. Makes me think it's a transient response issue on the PSU. I'd like to run my games at 1800p ~120Hz since I know this card should be capable of it.