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Intrinsic said: 

I think even the base PS4 had a seperate pool of DDR3 ram. Though i think it was like 256MB or something like that. So really what we saw in the PS4pro is just a progression of that. It really comes down to what they intend to do with the system OS. If for some reason they decide to have as much as 8GB of system Ram, then in that case it would make more sense going for LPDDR4 ram as a seperate ram dedicated to the OS leaving the 16GB/20GB of GDDR6 ram untouched for games.

I thought PS4 was solely GDDR5. That would make more sense why Pro went that route then. Would also make me think a separate 4GB of DDR4 might be more likely in PS5. You learn something new everyday. I would think 16GB for GPU would be a definite, maybe 20GB. 24GB + 4GB seems too much.

Intrinsic said: 

Well, Right now a 240GB SSD costs around $70 at retail. In 2020 it would probably cost around $50 at retail and for sony, soldering nand chips onto their MB (which costs even less than bulk ordering SSD drives) it would most likely cost them significantly less. So they could be spending like $20 or so for 200-256GB worth of nand flash storage. Another $20 for a 1/2TB mechanical drive. So its doable. 

Or the could spend like $40/$50 on what would amount to around 840GB/1TB of on board nand flash storage and forgo the mechanical drive completely  while still making room for the customer to put in there own HDD if they wanted or supporting external HDDs from day one.

Good points. Maybe 256GB flash plus 2TB HDD for base PS5, and 1TB flash and no drive for Pro? Base users will still mostly want a complete package out of the box I think, but Pro users should be able to add an external drive without issue, and possibly internal depending on the Pro case design.