Will this work with my 500w PSU (Power Supply Unit)?

Anyone know if a 500w PSU will be safe with my new GPU?
Specs;

Motherboard: Asus M5A78L-M LX V2
CPU: AMD FX-4100 Quad core running 3.6ghz
New GPU: AMD HD Radeon 7870 2gb GHZ edition

Devices connected;
3 USBs (MOUSE, KEYBOARD, WEBCAM & Maybe iPhone)
1 HDD
0 CD
0 DVD
0 Blue Rays

If it's a quality 500W psu you'll be ok. A 500W psu is the bare minimum in order to use the HD 7870. You won't be able to overclock the processor or card with that card installed, you'd need a larger psu for that.

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