It's 6400 MT/s per pin, so a 128-bit bus gives 6400 x 128 = 819,200 Mb/s or 102.4 GB/s.
"The table below outlines the basics. Just like the Switch 1 clocks I reported on just over eight years ago now, we get CPU, GPU and memory clock speeds. When docked, we get the projected 102.4GB/s of memory bandwidth, shared between a GPU running at 1007MHz and a CPU clocked at a bafflingly low 998.4MHz."
How can the lack of a 4K output not affect testing though? This would literally affect game performance benchmarking/compatibility testing during development. Chances are, the final product doesn't have it either.
Except for Jeff Grubb. He's a solid superstar. People in here have told me he knows everything and that I have to believe him and what he says even though I used to think he was full of shit. How wrong I was. I now praise at the feet of lord Grubb.