Errr there won't be any difference. The reason ps1.1 is slower than ps2.0 is because 2.0 can cut corners that 1.1 effects can't, just like fixed function pipeline effects generally are much slower than ps1.0 effects. Ps3.0 offers some more advanced shader routines, which aren't even used by the gcn afaik. IMO 3.0 was just a waste of time, I havn't really even seen anything truly worthwhile come from it.