Check ram speed in windows 10

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Is that very low DRAM frequency I am seeing on the CPU-Z memory tab the actual speed that my Intel Comet Lake mbo runs the Hynix at? and (same tab) there is another 'NB frequency' (North Bridge?) with twice the speed of DRAM when on the power adapter but shows the same speed on battery (600-1100 MHz only) it fluctuates, average is 600 MHz on battery probably my 'balanced' power setting is throttling the CPU. Is there perhaps an update for this Tutorial? I have a query about my laptop memory (see my profile for system details) that I want to update to 32 GB (Dual Channel, I have 2 slots, 1 is empty) and use CPU-Z to find out the actual speed I run my present SK Hynix (HMA851S6CJR6N - VK Non ECC PC4-2666V 4GB DDR4) at.