Man.. you do realize that the bandwidth on that bus is bandwidth * frequency, right?
512bit doesn't mean anything by itself, it's just an out of context number. If you were discussing two buses with devices running at the same frequency, one bus at 512bit and one bus at 256bit - then there might be something interesting there. Really though you could get the same bandwidth by doubling the frequency of the 256bit bus.
So this isn't a case where "MOAR BITS EQUALS MOAR BETTAR."
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