I'm planning a build for later this June ( http://secure.newegg.com/WishList/PublicWishDetail.aspx?WishListNumber=14662529 ) and i'm wondering whether to go for the seasonic 620w M12II ( http://www.newegg.com/Product/Product.aspx?Item=N82E16817151095&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-Power%20Supplies-_-SeaSonic%20USA-_-17151095&AID=10440897&PID=3938566&SID= ) or the cheaper S12II ( http://www.newegg.com/Product/Product.aspx?Item=N82E16817151096&Tpk=seasonic%20S12II%20620w ) as far as i can tell the only difference is The M12II haspower modulation and my question is what difference does that actually make?