How much wattage does my PSU need

Torrance1

Honorable
Jan 9, 2014
1
0
10,510
I am building a pc for gaming and web browsing and school work. How much wattage do I need to make it run smoothly. The parts I'm already using are

Amd Athlon x4 760k
8gb corsair vengeance 1600mhz
Radeon 7850 2gb
Avp defender 400 k2 case
1tb western digital blue
F2a55m ds2 gigabyte motherboard
Lite on 24x DVD writer
Extra case fan as there is only 1 built in.

Thanks in advance