it depends on the resolution.. the 512 Mb memory is build for fairly big mobitors it seems.. so if youre staying at 1600x1200 max,.. the 512Mb version is just 3~4% faster than the 256 Mb one. If thats worth it to you... well, only you can decide that for yourself ofcourse But i'd say no, not really. ( some games were a bit more off than others.. but in average i mean ofc )