Why do you overclock the CPU on a gaming box that has as old GPU as the 275 GTX? Anyhow, the older generation GPU, combined with overvolted CPU, would explain the 375W power draw, but only when gaming tough.
On a side note, I hope you never use those fans at their 100% duty cycle, because I'd think the case would more or less take off, not to mention the noise. Even ~1500 RPM sounds like a hurricane, at least when I was still using that same case. Still, it's good airflow at the cost of silence, but that's a tradeoff I'm no longer willing to take.
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