How AMD, Intel, Nvidia are keeping their cores from starving
During the recent launch of its 96-core Epyc Genoa CPUs, AMD touched on one of the biggest challenges facing modern computing. For the past several years, the rate at which processors have grown more powerful has outpaced that of the memory subsystems that keep those cores fed with data.
But while the move to DDR5 4,800MTps DIMMs will boost bandwidth by 50 percent over the fastest DDR4, that on its own wasn't enough to satiate. AMD engineers had to make up the difference by increasing the number of memory controllers and thereby channels to 12. Combined with faster DDR5, Genoa offers more than twice the memory bandwidth of Milan.
Micron expects memory speeds to top 8,800MTps within DDR5's lifetime. In a 12-channel system, that works out to about 840GBps of memory bandwidth.
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