the newer ps3s are not 'hacked', so instead of playing games via software hacks, we actually connect a device to the insides of the ps3 to 'trick' it into thinking there is actually a game physically in the drive.
a bit like sky3ds, and gw.
gw is 'better', but on the latest fw, it is simply not possible to use gw. but sky, it is possible, because it works in a different way