pawel86ck
Banned
It's very simple concept, and they have explained it very well. Nothing is left vague.And there you go, the reason why 2.5 x is left vague. LOL.
Timdog will be posting about effective 2.5 x 16 GB memory next. MS really need to clean up their act.

Xbox Velocity Architecture: A Closer Look at the Next-Gen Tech Driving Gaming Innovation Forward on Xbox Series X - Xbox Wire
When we set out to design the Xbox Series X, we aspired to build our most powerful console ever powered by next generation innovation and delivering consistent, sustained performance never before seen in a console with no compromises. To achieve this goal, we knew we needed to analyze each...

This innovation results in approximately 2.5x the effective I/O throughput and memory usage above and beyond the raw hardware capabilities on average. SFS provides an effective multiplier on available system memory and I/O bandwidth, resulting in significantly more memory and I/O throughput available to make your game richer and more immersive.
2.4 GB/s x2.5 multiplier from their quote results in 6 GB/s RAW (12 GB compressed). So Xbox One X or XSX without SFS technology would need to use 6 GB/s SSD in order to achieve the same results. SFS also multiply RAM because the need to load 2.5x less data.
I wonder now if PS5 has similar technology?