The MX core is built into a motherboard chipset with many other functions and I don't think it should be the only thing tested (After all, if that chipset frys, the whole motherboard is dead). Increasing MX clock speeds does not show any improvement beyone small single digit improvements (1-3% etc) because what limits their speed in the majority of applications is the memory bus. What sucks about the MX,is that it's mem bus is multiple times slower than the real GF2, and that is why it doesn't even come close (There is no way to overclock a 128-bit SDRAM bus to GTS speed of 256bit DDR). What sucks about the nForce MX, is that it doesn't even hav it's own memory bus! It uses your MUCH slower system memory (Making it slower than the average MX), meaning any significant overclock would involve overclocking the rest of your system (Memory, CPU, etc). Simply, I wouldn't do it unless I was overclocking my CPU anyway.