Most of PCs RAM that a game uses, is used to stream in resources to the GPU that would otherwise read from an HDD (in most cases). In other words, most of it is just used as a fast cache.Actually minimum 11GB because you have to include the VRAM... removed the OS and you will have easily 9GB.
S has rumored 7.5GB for games excluding the OS reserved.
It is way lower than PC minimum these days and with next-gen console PC minimum was supposed to get a big jump in minimum specs but we have S now.
That is why xb1 & PS4 could more or less use all their memory for GPU stuff.
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