They are using GPUs with large amounts of GDDR5 to store the most important data, so the increased memory bandwidth is a major part of the performance upgrade o

They are using GPUs with large amounts of GDDR5 to store the most important data, so the increased memory bandwidth is a major part of the performance upgrade over CPU using DDR3. edit: The maximum bandwidth for DDR3 looks to be ~50GB/s and they are saying over 500GB/s in the GPU system I say DDR3 because they have been doing this since before DDR4 became available. Even DDR4 is something like ~70GB/s