[aryan-achilles]

Yeah, there are plenty of examples where cards with lower core and memory speeds manage to outperform those with higher speeds. For example, the Geforce 6800 Ultra has a significantly lower core spped than the ATI Radeon X800.......but still in many reviews and benchmarks that I've seen or read, the 6800 beats the X800 comfortably. I dunno the reason exactly, but maybe it's the architecture of the card that makes all the difference.

That was just an analogy - I don't think variations in memory speeds could lead to incredible differences in the card's actual performance (as much as 40%).