Processor speed reference
Processor speed reference
The data rate in cpuz appears to be being reviewed. Your RAM operates at double data rate, so double the reported speed—resulting in a 3200 MHz frequency.
Software indicates I/O bus clock speed, and DDR memory now matches that clock rate, meaning a 1600MHz bus equals a 3200MHz data rate. Servers typically use DDR4 starting at 1600MHz, though that was the original launch point. It seems incorrect—single and dual channels should display identical frequencies in CPU-Z.
I believe it's because of the way the information is presented.
In the past, SDR memory operated at the same data rate as its real-world frequency, so when promoting DDR's benefits they focused solely on data rate while overlooking I/O bus clock details, even though both factors played a role throughout the process.