There are TWO clocks in DDR5 - “command clock” (CK) and differential “data clock” (WCK=2*CK) (data are transferred on rising and falling edge of WCK) ([url]https://en.wikipedia.org/wiki/GDDR5_SDRAM[/url]). “nvidia-smi” show “data clock” (WCK) speed. I agree that this is confusing (also check Memory “MHz” or “MT/s” and “DRAM type” at [url]https://en.wikipedia.org/wiki/List_of_Nvidia_graphics_processing_units[/url]).
“nvidia-smi” should show “MT/s” as primary unit (also fan speed does not show true “speed” but requested cooling level).