im planning on making a simple computer with the amd a-series a6-3650
will have no separate graphics card
500gb hard drive
dvd burner
4 gig ram
How many watts will i need?
And if you have a bigger budget and want something really efficient...
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151097
Fanless series is considered one of the best and I do tend to agree with you but considering he wants an AMD build most likely he is vying for a very budget build.
The PSU calculator below will allow you to accurately determine your PSU requirements. Once you use it then you can refer other folks to it for accurate PSU info.