The problem I see is that people will surely demand an HDMI output (Sony can sell a dock for it and/or allow USB-C to connect to monitors and TV) and then we will start the dance of HDR, 4K, VRR, etc… output.
IF this becomes a Steam Deck competitor, I would almost prefer it to be them joining forces with Valve and avoiding fragmentation… but I would fear they would just go Windows…
That would be a gaming handheld but not a PlayStation per se as it would only play PC games… so as much a PlayStation as everything is an Xbox
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IF they go for running PS1/2/4/5(patched?) software, if they were a true next-gen PlayStation Portable with its own BC titles support and new titles ported to it or released with PSP-NG support then Sony is designing their own Series S so they need to be very very very very careful.
This would need not to hold PS5 and maybe PS6 back (unless it did not support PS6 titles unless they were explicitly cross-generation):
I would see it as a device:
- docked vs undocked HW performance profile (faster fan speed, faster clocks, etc…)
- quite a lot of RAM, might not be super mega fast but it would not limit the main consoles; dedicated slower RAM for the OS to minimise fast RAM dedicated for games
- faster / even less CPU overhead / more dedicated silicon for I/O, managing the OS, networking, Sound, etc… try to reduce the amount of CPU reserved while running games
- faster than PS5 I/O to prepare for more and more data I/O heavy games and again minimise cost of swapping data in and out of RAM
- VRR and HDR support on the system display and on external displays
- ML/AI support to allow running PSSR at a lower rendering cost (make it easier for devs to integrate and upgrade PSSR implementation, focus on upscaling from lower than 1080p for these portable optimised PSSR profiles)
- focus on optimising HW for 900-1080p PS5 performance (includes smart upscaling from lower resolutions so I would not say devs need to target native 1080p) ideally with headroom over per pixel performance over PS5 Pro not to hold PS6 back too much (this does not mean faster than PS5 Pro in absolute terms, but faster per pixel might be a better way of putting it)
— as mentioned before same or more (I would say quite a bit more) RAM than PS5
— customised Zen4c or Zen5c equivalent low power but higher single threaded performance cores (8 cores with SMT but higher clockspeed and/or improvements to match or hopefully well exceed PS5 CPU’s IPC)
— beefing up the shared GPU components that do not vary with CU count (rasteriser, geometry engine, shared caches, etc…) compared to PS5 and PS5 Pro (it could be a mix of architectural enhancements, more and/or better caching, and clock speed)
— beef up each of the CUs: you can have and will likely have far less CUs than PS5 Pro but their design should be a more advanced and more powerful version of what we have in PS5 Pro CUs
This could be a good strategy for them not to stretch their software devs and introduce another performance target, not that I would love it, but…
Introduce console generation, wait a few years and release that generation Pro version, wait a few years and release the Portable version, wait a few years and release a next gen console, wait a few years and release the next gen Pro version , wait a few years and release the next gen Portable version, etc…