Why nvidia-smi showed 1060 3GB memory clock to 4000MHZ

As I know, nvidia 1060 used GDDR5 and memory speed reached 8000MT/s, for GDDR5, memory clock should be around 8000 / 4 = 2000MHZ.

For my 1060 3GB card, nvidia-smi showed Clock speed reached 4303MHZ, I am confused what kind of GDDR5 nvidia using.

Graphics : 1873 MHz
SM : 1873 MHz
Memory : 4303 MHz
Video : 1683 MHz

Below website also indicated that 1060 memory clock should be 2000MHZ.

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) (https://en.wikipedia.org/wiki/GDDR5_SDRAM). “nvidia-smi” show “data clock” (WCK) speed. I agree that this is confusing (also check Memory “MHz” or “MT/s” and “DRAM type” at https://en.wikipedia.org/wiki/List_of_Nvidia_graphics_processing_units).
“nvidia-smi” should show “MT/s” as primary unit (also fan speed does not show true “speed” but requested cooling level).