Yeah, that definitely doesn't look like a stable unlocked 4th core. I'd just keep it as a triple core. If you want a quad core, you can always buy one. As far as your voltage goes, I'd say you could definitely lower it down to at least 1.3, maybe lower. I have a Phenom II X4 955BE and currently have the voltage set to 1.29 in the BIOS, CPU-Z reporting 1.280 effective.