@gouca keep in mind there were improvements to the CPU's Integrated Memory Controller (I.M.C.) from Zen/Zen+ (e.g. 1600AF) to Zen2 (3700X).
It will / might be a struggle for the 1600AF to run your DRAM at 3200 MHz.
Try and see if DDR4-2933 (while using XMP timings and voltage) is possible first.
Matisse is Zen2 (e.g. your 3700X):
Pinnacle Ridge is Zen+ (e.g. Ryzen 2000 series, 1600AF):
Thanks, will do. I actually did own a Rampage II Extreme, a few years ago, which was insane but their availability is next to zero at any reasonable price.