If you are going to undervolt, I would recommend try 1.32V first, if that works, drop it to 1.30V, if that works drop it to 1.28V, etc. Until it won't post anymore...then go back to the last setting that worked and run prime95 for a few hours to make sure you have no errors. If you get an error in prime95 go back up another notch to the one before that one...