the two lumps you can see on the chipset Chupo are epoxy that is covering some bridges, underneath one of them is the bridge that you need to connect to convert you nfoce4 ultra chipset to an sli chipset, this was a very common mod on the old lanparty nforce 4 ultra boards, some of the later ones cam with epoxy like yours covering the bridges, believe the other one allows for more raid functions but not sure on that.