Graphics cards and PSUs

maccers

Geek Trainee
I recently built a new PC:

Motherboard: Gigabyte GA-946GMX-S2
Processor: Intel Pentium Core Duo @ 2.00ghz
GFX card: Sapphire ATi Radeon HD 2400XT

Now the problem is whenever i install the gfx card the computer starts up, then 3 seconds later it resets itself, but it boots up fine using the onboard vga. I went into BIOS setting (Award) and changed the Init Display first to PEG (PCI Express x16) and onboard VGA to Enable if no Ext PEG (only options was that or always enable).

Now i didn't realise that my GFX card minimum spec is power supply: 550W, however my PSU is only 450Watts, would upgrading the PSU remedy this problem?
 
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