You are explaining what virtual texturing is with a looong post full of buzz words, sfs is simply an enhancement of prt and has existed in amd gpus for a decade.
So it isnt some new alien technology that you keep worshipping you guys sound like brainwashed minions of spencer hes got you fooled.
virtual texturing is SOFTWARE BASED hence why its called SOFTWARE VIRTUAL TEXTURING unless accelerated by HW like SFS. PRT has hardware but has limitations.
1. PRT did not allow the dev to see what was going on with the data, so even things you didn't need were loaded and devs could use a best guess approach for what was next.
2. PRT did not have the HW texture filters ONLY present in the XS consoles
3. PRT is slower than SFS
SFS IS HARDWARE BASED...SFS can be used to accelerate virtual texturing. PRT is old...SF came after that...prt+ SF came after that and now we are at SFS.
SFS is quantifiable with a 2.5x on average EFFECTIVE ram capacity increase and a multiplier of I/O speed. MS say SFS only uses 33% of texture data that would otherwise be used.
for example:
if the PS5 had to load/stream 14 GB of texture data the XS would only have to 4.66 GB to load/stream.
time to load/stream 14 GB of texture data:
PS5: 14 GB@ 17.3 GB/s (MAX realistic speed with OT) =0.81 seconds
14GB @ 22/GB/s (Unrealistic speed)= 0.63 seconds
XSX: 4.66 GB(SFS 14 GB equivalent) @ 4.8 GB/s (minimum speed) =0.97 seconds
4.66 GB @6.1+ GB/s=0.76 seconds (assumed maximum speed as MS said beyond 6 GB/S for the decom block and 4.8 GB/s was the "worst case scenario" speed)
as you can see, they are about equal in this scenario however the advantage goes more in favor of the XS the more it has to load/ stream and it can load more into ram. SFS gives the XSX 33.75 GB of EFFECTIVE usable RAM capacity.
STREAMING 20GB FOR EXAMPLE:
PS5: 20GB @ 17.3 GB/s (MAX realistic speed with OT) =1.15 seconds
@ 22GB/s(Unrealistic speed)= 0.90 seconds
PS5 MUST STREAM THE 20 GB
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XSX: 6.66 GB(SFS) @ 4.8 GB/s (minimum speed) = 1.38 seconds
@6.1 GB/s= 1.09 seconds (assumed maximum speed as MS said beyond 6 GB/S for the decom block and 4.8 GB/s was the "worst case scenario" speed)
XSX CAN LOAD THE 6.6 GB 2.5 TIMES AND/OR STREAM at the same visual quality as PS which means you can POTENTALLY get higher quality on XS