WOL not working

Hi ALL;

I have 50 computers and 45 computer work fine with WOL software which I use to send magic packets. Only 5 cannot wake up.

I did check NIC card and found the one which does not work has Realtec PCIe GBE Family Controller #2 and different version where as 44 PCs work with older version. 

I have checked the local policies.. ditn find any difference.. also enabled WOL on BIOS.. Any one helps I would appreciate a lot.