This adapter don't do anything for your DDR4 RAM. Instead, as spotted by Akiba PC Hotline, the "JET-5669AA" DIMM adapter that lets you install install DDR5 SO-DIMM memory into a full-size DIMM ...

This DDR4 RAM has a 3200 MT/s transfer speed, which is great for a gaming laptop. Its Column address strobe (CAS) latency of CL22 is not that low but should do, as you already have a fast transfer ...