Maximum temp for your processor is 74C, so you should probably stay at 60C or below. Before you do anything else, get a better HSF. Then you can potentially give it a minor Vcore boost. In the meantime, you should google around for good AMD overclocking guides. The Phenom OC guides will do a good job of explaining the chipset voltage tweaks you might need (if you need any at all) but the Vcore will obviously be different since you have an Athlon II x2. I'm not comfortable giving you voltage recommendations since it's been a while since I've OC'd anything on the AMD side. The last AMD processor I messed with that was of any consequence was the 720 BE. I'm considering going over to Microcenter to pick up a 1055T and 890-based motherboard just to brush up on the AMD-isms.
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