Faster RAM isn't the whole story — Gear Mode changes how it behaves.

So I have a laptop with 6850u cpu and 4x8 GB 6400 MHZ LPDDR5 RAM. Each of the 4 channel has bus width of 32 bit. The theoretical memory bandwidth for this setup should be ~ 102 GB/s. I ran different memory bandwidth tests (ramspeed, stream, aida64) and the upper limit for the bandwidth seems to be ~ 51 GB/s limit (Even for GPU although this is based on LLM inference speed observations). Here is a review of the same laptop where AIDA64 memory copy speed is presented and all the speeds are below 51 GB/s. <https://www.notebookcheck.net/Lenovo-ThinkPad-T14s-G3-AMD-laptop-review-Quiet-and-efficient-workhorse-with-Ryzen-power.682906.0.html> What is limiting the memory bandwidth?