It's reporting operating speed. You just have to double the figure. 1596.8 MHz x2 is ~3200, normal for DDR4-3200.I have 4 sticks of Corsair Vengeance 8GB DDR4 RAM advertised at 3200MHz, but Speccy lists my DRAM frequency as 1596.8 MHz.
I have a Gigabyte B550M DSH3 motherboard and a Ryzen 7 3700x CPU
How do I reach 3200MHz?