I have this XFX 780i mobo... I tried putting 4 stick Dorminator but when booting, it says 4 DIMM not supported? My 4 stick Dorminator tested all no problems... I swap slot and swap Dorminator using 2 DIMM slot no problem...

Use 4 DIMM slot... after boot into windows... only 2 gig is recognise... WEIRD!!???