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fatslob-:O on 17 February 2018
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Pemalite said:

GDDR6 will be cheaper than HBM. Sony and Microsoft will opt with whatever is cheapest.

GDDR6 will also be mass produced to a higher degree than HBM, so it will have the advantage of scales of economy.
GDDR6 will also see improvements over it's lifetime, not just in terms of cost... But power consumption, densities, bandwidth... And that should transition nicely to a Slim revision.

Honestly if the memory chip module manufacturers can't provide HBM at reasonable prices for console manufacturers then instead of using a short term workaround like GDDR6, I would wait and hope for the JEDEC board to standardize GDDR7 by 2020 and wait for console manufacturers to release their next gen systems by 2021 to coincide with the successor to the Navi microachitecture ... (next generation maybe our last generation since we could run out of maximizing transistor technology so we need a reasonable baseline for next generation in terms of both new hardware features and raw power to provide a high incentive for customers to purchase new systems but hopefully Samsung will ramp up EUV for this year so that we can use the technology to enable higher performance and density for DRAMs)