EonW :
There's no link.
However, the numbers simply explain the given wattage on each rail, so eg +12V x 44A =528 Watts on that rail so that you can work out whether you have enough power for certain components, The +12V rail powers the most power hungry components, so this is what a lot bof people look at, as well as just the overall wattage eg 550W.
woops sorry I forgot the links so I made a new post but here they are in this post
1st psu
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139048&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
2nd psu
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139050&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
anyway, I'm just curious if I can get away with the cheaper one (the 500m) in a build with an i5 3470, a radeon 7870xt and four fans (3 case fans and one cpu fan) or if I need the beefier 600m to power all these things while gaming.