Help me understand my ram speed

[majic12]

I just got a 4x16gb corsair kit CMK64GX4M4B3200C16 pared with a 7960x

In my asrock x299 bios i just entered the OC section and selected from the ram speeds the option 3000mhz(as the defaut was 2133)

In windows task manager it does say speed 3000mhz and after reboot the bios shows 3000mhz too, but than i decided to run firestrike a few times and had activated in the background HWiNFO64 and in the section ''memory timings'' i saw that the current memory clock was 1500 and max it got was 1600 and something?
Memory clock ratio 30.00 x
and everything was at 21 21 21 50

Does this means that the ram is working as it shoud at the selected 3000 or not?Never managed to understand fully HWiNFO indications.

 

[tedych]

DDR(x) Ram is "Double Data Rate". If it runs at 1500MHz (real), it uses both rising and falling edge of the clock signal, so effectively it doubles the datarate and while not entirely correct, manufacturers usually give this double number as MHz, e.g. 3000.
So your ram runs at real 1500MHz, period. But effectively as using the clock signal it can use it for two transfers, it is widespread to call it 3000MHz which is not strictly correct. But it's found everywhere, even in BIOSes.
Similar issue you can find with HDD capacities, GB, GiB units etc.