Indeed. What actually matters is memory bandwidth which is a combination of bus size and memory speed. For example cards with DDR5 ram and a 128 bit bus actually have slightly more bandwidth than those with DDR3 and a 256 bit bus.
In general the average person looking to purchase a video should really ignore almost all the individual specs of a card(apart from different versions of the same card.) What matters in the end will be performance so benchmarks are all that really matters.