Im pretty sure crucial uses the manufacturer's maximum supported. I did not know about the wmic memphysical, very handy.
wmic memphysical get maxcapacity gives me 67108864. Just wanted to check but is that per slot or Total combined? But either way it looks like it should work with my 32gb sticks.
Edit: After looking into it a little bit it would appear that its per memory slot, so if I understand correctly the maximum memory for my g531gt is 128gb total