they used faster memory than nvidia, but on a narrower bus
the cost to add a wider bus, and the cost for extra memory chips seems to offer a worse price/perf ratio than to leave it as is.
if they increased the memory bandwidth by 30-40%, then costs would have probably gone up by 20-30%, while perf might have only gone up by ~10%, and power consumption up by 8-15%
AMD must really be hurting if they have the balls to keep their prices the same since launch





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