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 (http://www.gigabyte.com.tw/Products/Chassis/Products_Spec.aspx?ProductID=2360)
Gigabyte GA-EP43T-UD3L motherboard (http://www.gigabyte.us/Products/Motherboard/Products_Spec.aspx?ProductID=3113)
Intel Core 2 Duo E6750 processor (http://processorfinder.intel.com/details.aspx?sSpec=SLA9V)
MassCool CPU cooler (http://www.newegg.com/product/product.aspx?Item=N82E16835150083)
BFG nVidia 9800 GT 512MB video card (http://www.bfgtech.com/bfge98512gte.aspx)
Kingston DDR3 1333 2G memory (http://www.ec.kingston.com/ecom/configurator_new/partsinfo.asp?root=&LinkBack=&ktcpartno=KVR1333D3N9/2G)
+ 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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