It's your decision, but I would run it at 4.1 or 4.2. No need to push it as you wont see much difference. Post this in the other thread and I will add it to the leaderboard.
Workers stopping or having errors means it is not stable. Usually needs more vcore.
Okay, I upped the volts to 1.45 and that help quite a bit. All the workers continue with their self tests without stopping, however I can't let Prime95 run for very long, maybe a few minutes 5 at the most. My chipset's temp increases really quickly when running it.
Excellent job. Very well done. I bet you surprised yourself. No since in burning your rig up. You did exceptional. Just be careful. Overclocking can become habit forming, expensive too.