3200MHZ RAM should run at the JEDEC standard, 2133MHz on any board with such a limitation.
There can be problems, in terms of a lack of post/boot, but those are pretty uncommon.
The only "problem" is probably overspending on 3200MHz that you cannot utilize - assuming it costs more than a comparable 2133MHz kit (or 2400MHz, or 2666MHz)... If you're going to have the RAM cut down to 2133MHz ayway, I'd opt for the cheapest kit that ticks the rest of the boxes.