Not sure dont have a opty. So far It is more stable for CPU and ram than the 1.C3 beta was. Just a margin better. They have messed around with the voltages a bit. Was having GPU issues and crashing in games until I realised that 1.C hates 1.65 AGP volts. Setting it back to 1.5 volts cured the problem.

Not sure if Ill keep it or go back to 1.C3 yet as I need to test it further. Also working on another bios that im scared to test incase it blows up the house but we will see