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[Mr.Phoenix]

Let’s see it is a few years away and getting the bandwidth they will need otherwise would put an enormous strain (huge power consumption too) on the external memory / main RAM.

Everything improves. GDDR7 should be on the market by 2024. It allows for up to 32Gbs. To put that in perspective, the PS5/XSX GDDR6 supports only 14Gbs. So GDDR7, even if underclocked as is the case in the current-gen consoles, and using the same bus width as the PS5(256bit) would still offer at least twice the bandwidth. Sonon that alone, the PS6, if using the same 25bit, and even less power than GDDR6, would get at least 896GB/s instead of 448GB/s. And if using a 320-bit bus... will that puts them at over 1TB/s.

Oh, another thing to consider is that bandwidth required is not just dictated by how much data you want to move, but so by how fast you want to move it. So a console that is targeting 60-120fps peak at 4K, may not even need as much bandwidth as something that is pushing to run 4K at over 200fps...