After the wired article my colleagues and I assumed that Sony had just put a PCIe 4 SSD into the PS5 and then called it a day (as PCIe 4 SSDs would be faster then current PC SSDs so it would fit their claim). I mean, the SSD came unexpected for us already since we were expecting at most a solution like Apples Fusion drives for cost reasons. Because of our PCIe 4 SSD expectation we were skeptical how much the SSD could decrease load times in PS4 titles played on the PS5.
For context: our current gen game (PS4, XBO, PC) loads around 40% faster when replacing the PS4 Pro HDD with a SATA SSD (~42 sec. vs. ~25 sec.). If we run our PC build in combination with an M.2 NVMe SSD we only see around 7% faster load times compared to the PS4 Pro with SATA SSD even though the NVMe SSD is ~6 times faster. But it get's even worse, when we take the Samsung PM1725a PCIe card from our build server to run the PC build on we only see 0-3% faster load times compared to an NVMe SSD, which shows that there are diminishing returns since current game IO has to assume HDDs as the baseline. Because of that we only expected similiar load time reductions for PS4 titles when played on the PS5. But we were proven wrong.
Together with our devkit (nothing from Microsoft yet) we received information material which was front and center about how they continue to strife to make the life for developers easier, in order for us to deliver better games faster to the players, and how that is a continuation of the ground work layed by architectural decisions taken in the PS4. The material is not only about new games though, but also about how the PS5 can help current gen games to take advantage of it's features - especially it's advanced storage solution. Apparently they have analyzed the IO behaviour of current gen games and baked the essence of it into what they call a high bandwidth cache controller, which can then map PS4 IO commands into optimized commands for their new storage solution were appropiate (without having to make changes to the game). And it shows, our unchanged game running on the devkit loads around 32% faster then our PC build on the PM1725a. But the material further states that in order to take full advantage of it the game will have to be patched, and I can't wait to see how fast our game will load once our software engineers have made source code changes to take full advantage of the fast storage.
This is obviously a throwaway account that I will delete in a few days... I have no technical data to share and I will not tell my position or company size like other "leakers" do as that could pinpoint me. Which is why I also disabled private messages. Just wanted to share that Sonys storage solution is a true next generation leap and that it will also greatly benefit PS4 games when played on the PS5 - even if the developers don't release patches for their games.