I agree a 256bit gddr6 interface is more reasonable for a 399 target, specially with the doubled number of channels it's a bigger footprint than gddr5. And it would be fine for a 7nm part, because without some AMD miracle with navi, we can't expect a 15TF monster....I don’t think they want to be stuck with 384 bit interfaces or a minimum of 12 DRAM chips when it comes to die shrinking and cost cutting. A 256 bit interface would age much more gracefully. Heck, HBM won’t look so bad once they can get sufficient via density on organic.
With the X1X, Microsoft doesn’t really have to worry about cost reductions, IMO. It may never be rev’ed, and I think that’s fine for what it is.
11TF/22TF figure
16GB GDDR6, 256bits
576 GB/s using 18gbps parts
It ends up with the same bandwidth ratio of X and Pro, around 50GB/s per teraflop.
It's not locked into that choice though. Maybe they can move to hbm for the slim revision and/or mid-gen refresh as cost allows. It's a nice two stacks of 8GB at 2.4ghz. And for launch they still have a very low cost and low risk with gddr6. 2019 isn't impossible with those specs.
I would still prefer a 2021 launch with 15-18TF from both Sony and MS. A same year launch would be as epic as 2013 which reignited the console industry.
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