Comment by Dylan16807

Well, what they don't tell you about GDDR6X is that it's 4 voltage levels but it never goes from min to max or vice versa in a single transition (PAM4 MTA). It transfers 1.75 bits per cycle.

And then GDDR7 backed off to PAM3 and sends 1.5 bits per cycle.

There's a good chance [LP]DDR will use the same techniques once it gets into the same speed range.