Guessing I need a new PSU to OC more?

I just finished building my first desktop with the following components:
Gigabyte GZ-X1 case w/ 400W power supply (
Gigabyte GA-EP43T-UD3L motherboard (
Intel Core 2 Duo E6750 processor (
MassCool CPU cooler (
BFG nVidia 9800 GT 512MB video card (
Kingston DDR3 1333 2G memory (
+ 3x 7200RPM SATA hard drives 1x DVD burner
I've read of people overclocking this processor to 3.5GHz stable on air. Given the cheap cooler I got, I don't plan to take it above 3.2, but as of now, I can only get it up to 2.92-- whenever I try going higher than that, the system tries to boot a couple times before reverting to default settings. I'm hoping this is due to the crappy 400-watt power supply I have running everything. I just want to be sure before I go out and spend money on a new one. Thanks in advance for any help with this.
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More about guessing more
  1. No specs. on your 400W PSU. If you're looking for suggestions, this page is ~601W to 700W 80+ efficiency, I've been using this for the last 13 months 24/7, no problems: CORSAIR CMPSU-650TX, it's ~$90 w/free shipping now.
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