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KratosLives said:

Someone please explain this to me. If ps4 has IO speeds of up to 100 mb p/s, and ps5 has up to 9 gb p/s, does this mean, on ps4, that for every second of screen time, that only 100 mb of data is rendered on screen, or is this a cumulative effect, where every second, 100 mb of extra data is read and added ontop to make more game detail. Like wise with ps5, 9 gb of data maximum per second or cumulative? 

I guess when you say "cumulative" your refering to like loading screens? when you store data off the hard drive into ram?
Yes the IO can load things from the HDD and that speed, and use things stored in memory without effecting each other (as I understand it).

Also 9 GB/s isn't the playstation 5's max.
Its theoretical max is over 20 GB/s, but in "normal" usage its around 8-9 GB/s (it can go higher depending on games and data and how well it compresses).