After speaking with support I was given this PDF link which explains my situation. Turns out the i7 and i9 processors support 2933MHz memory. Thanks!
Hey folks. The spec sheet for the G5 desktop says max memory speed is 2666MHz, but when I open Alienware command center and CPU-Z it's being reported as 2926MHz (or 1462x2). It's the original memory that it came with and is being reported as 3200 speed (I realize that it won't run that fast). I recently updated the BIOS to 1.0.5 but there's no changelog to tell me if that was responsible or not. I do not know what the memory was running at before I updated. Can someone shed some light on this for me? I want to order a set of 16GB but am now confused as I didn't think there was a point in ordering more than 2666MHz. Thanks!
Inspiron G5 5000, DDR4 memory speed