Gear 1 and Gear 2 is to Intel what AMD's Infinity Fabric one to one ratio vs one in two, 1:2 ratio allows for higher Memory overclocking at the expense of the IMC running at half speed, with AMD that can reduce performance because the IMC is linked to the Infinity Fabric Clock, running it at half speed increases the Core Interconnect latency.
With Intel it doesn't matter, its a monolithic die, there is no Interconnect.
I suspect Intel's apparent "higher Memory Overclocking" was never anything to do with having a "Better IMC" or AMD's being "weaker" i think Intel always cut the IMC bus speed in half over a certain memory speed, it just did it in the background without you knowing about it, where as with Zen this has always been visible because AMD allow you to adjust it manually, Intel are simply following AMD's lead with Rocket Lake.