There is a hardware decompressor in the Sony patent and a secondary CPU probably an ARM CPU for manage the SSD... The Zen 2 CPU just ask for the data, wait and receive the data, nothing more. The GPU have nothing to do with the SSD management and data decompression...
Everything is perfect in the patent it is the result of two years of work...
Edit: And no one out of developer know the speed maybe it is 4 of 5GB/s maybe 10 GB/s or maybe 20 GB/s
No matter how fast your decompression is, you will never be able to process 5GB/s. I haven't read the entire Sony patent but we are seeing PCIe 4.0 SSDs that have been announced and most of them are ~5GB/s max theoretical speed. Let's be honest with ourselves, the PS5 is a console and it will have something akin to a buffed up low-mid range SSD, patents and all. ~5GB/s is what we should expect, anything more than that will be amazing for a console and combined with decompression, you just can't use the SSD as memory and it will not be able to feed the memory fast enough. It's an amazing HDD, not a replacement for more memory.
All I'm saying is that you are over positive in an unrealistic manner. Before you've edited your message you've said that anything under 10GB/s will be a waste of effort, that's crazy. You need some more
Colbert in you :)
If the consoles are 1) sold at a loss of $100 and 2) sold at $500 they have plenty of money to fork out for ~24Gb RAM.
I think the 8Gb of RAM in the PS4 was $80. They have an extra $200 budget to spent if they sell at $100 loss and $500. So if $160 is the cost of 24Gb they can put that in and still have an extra $40 to spend on the rest.
Not sure whether they will go GDDR6 or HBM but again, like the 8TF people, there is no way next gen consoles have 16Gb RAM.
That 160$ figure is way out of proportion, it will never cost them 160$. Do you know how everyone got to that number?
From this story. They took the 11.69$ figure, added the 40% discount and multiplied by 24. That is obviously very far from what Sony and Microsoft will get because:
1) These are January 2019 prices, not Summer 2020 prices. GDDR6 is very new and DRAM prices have been on a free fall in the past year, GDDR6 will be much cheaper than 160$ in 2020.
2) Why even use the highest price in the table? 13Gbps cost 9.25$ per GB in the article, so that's 133$ BEFORE the DRAM price drops. 24GB of 13Gbps GDDR6 results in 624GB/s, that's probably higher than any of us expect in the PS5.
So please forget about the 160$ price point for 24GB, people here recite it but it's not true. It will probably be closer to 100$ or 110$ if in January 2019 it was 133$, just a few dollars more than the PS4's 88$ per 8GB of GDDR5.