Heydre,
I don't understand why you insist on using a 330W PSU, especially from Enermax. If you're going for an overclock, I think you should either get an antec 400, or just about anything else that's rated higher. That way, it'll keep all your voltages stable. Also, when you're ready to upgrade, you'll have a decent PSU.
I'll be using an Antec 460W myself.
If you have a voltmeter (or MBM), take a close look at those voltages. If they fall more than 5% outside the rated voltage, then you found your problem (then and now).
I don't understand why you insist on using a 330W PSU, especially from Enermax. If you're going for an overclock, I think you should either get an antec 400, or just about anything else that's rated higher. That way, it'll keep all your voltages stable. Also, when you're ready to upgrade, you'll have a decent PSU.
I'll be using an Antec 460W myself.
If you have a voltmeter (or MBM), take a close look at those voltages. If they fall more than 5% outside the rated voltage, then you found your problem (then and now).