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Memory Interface Width

post #1 of 2
Thread Starter 
Quick question, why do older GTX series cards, such as the GTX 280 have a wider memory Interface width than newer high end cards? The GTX 280 has a 512–bit interface where even the new GTX 780 only has a 384–bit width.

Does this smaller width cause an unnecessary bottleneck or were the original bit widths on the older cards simply to large and were scaled back? Would the GTX 780 benefit from a 512–bit width or is 384–bits enough?
post #2 of 2

There are two components of memory bandwidth - bus width and frequency.  So those larger bus widths were there to compensate for the lower frequency of the VRAM itself.  So you really need to compare the actual memory bandwidth, not just the bus width.

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