PSU Help

New to the forums...
What psu would i need for this setup?
When i play cpu games, the comp restarts after a while.

Operating System
MS Windows 7 Ultimate 64-bit
CPU
AMD Athlon II X3 445 26 °C
Rana 45nm Technology
RAM
4.0GB Dual-Channel DDR3 @ 666MHz (9-9-9-24)
Motherboard
MSI 870A-G54 (MS-7599) (CPU1)
Graphics
Acer AL1916W @ 1440x900
512MB GeForce 9600 GT (BFG Tech) 71 °C
Hard Drives
313GB Western Digital WDC WD3200AAJB-00J3A0 ATA Device (IDE) 45 °C
Optical Drives
SONY CD-RW CRX320E ATA Device
Audio
Realtek High Definition Audio

Morc:

Visit Newegg at the link below. It will suggest the amount of power your new PS should provide. I also suggest adding an extra 100 watts for future expansions.

Newegg.com - Recommended Power Supply Calculator.

ok so a 500-600 watt psu would do? also have a printer and a logitech g-13 game pad connected to usb.

thanks