Latest T-Rex 0.26 is very unstable under RaveOs 8820-2060, even in stock OC.
GPU fault & Reboot every 20-60 minutes.
I'm seeing the same in Windows 10, also with stock OC. Unable to find nonce. Restarts every 10-20 minutes.
Now the final version is out - very stable and more poolside hashrate than NBminer