gf4 mx is as slow as as gf 2 ti under softquadro and rivatuner... out of choice I would either go for a Softquadrod GF3 Ti500 or a GF4 Ti4600 if you have money to waste or a gf4ti4400 or gf4ti4200 if you don
t mind over clocking and youll probably get a bit more speed than the SQ
d gf3 
OCing can be good because by the time you
ve burnt out your card in about 2 years or less time you
ll probably have already bought a new one anyway.