This forum post may help. And if you are looking at DRAM frequency remember that it is DDR RAM and clocked at 1/2 it's rated speed (thanks to [NAME] for that information on the linked page). Users have had that problem for years when using CPU-Z to report RAM speed and forgetting it is DDR.
I got a Dell XPS 8950 i5 12th Gen that came with 8GB DDR5 from Dell. I bought 3x8GB Crucial RAM 8GB DDR5 4800MHz CL40 Desktop Memory CT8G48C40U5 total of 32GB ram, but my system is running at 2400MHz. [URL] Is this normal. I saw the PDF specs but they don't mention 4x8GB set up 32GB total. Any solutions to increase to 4800MHz? My bios is up to date 1.11.1 Thanks
XPS 8950, Crucial ram running at 2400MHz