SIZE MAT­TERS…LESS

HWM (Malaysia) - - LEARN -

At the start of this ar­ti­cle, we men­tioned how 4GB of HBM may seem pal­try com­pared to to­day's much larger GDDR5 ca­pac­i­ties, but AMD does not see its mem­ory ca­pac­ity as a po­ten­tial per­for­mance lim­i­ta­tion. Larger GDDR5 mem­ory ca­pac­i­ties have been an in­evitable byprod­uct of the need to in­crease mem­ory band­width by in­creas­ing mem­ory bus width, which in turn re­quired more GDDR5 chips. AMD says that this has ac­tu­ally re­sulted in more ca­pac­ity than is ac­tu­ally needed, and un­used frame buf­fer ca­pac­i­ties ef­fec­tively serve no func­tional pur­pose what­so­ever.

Now, be­cause of the im­pres­sive 512GB/s of band­width made avail­able by HBM, AMD no longer needs to in­crease mem­ory ca­pac­ity for the sake of more band­width. In­stead, it all comes down to ef­fi­ciency and how ef­fec­tive driv­ers are at man­ag­ing the 4GB frame buf­fer.

Nev­er­the­less, we ex­pect larger HBM ca­pac­i­ties in the fu­ture, ei­ther by utiliz­ing larger DRAM dies per stack or in­creas­ing the num­ber of stacks.

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