According to the motherboard's specifications, some memory modules can indeed work at higher speeds but that won't happen OOB, it needs over-clocking.
Without OC any RAM there with your CPU+GPU - 3rd Gen Ryzen with Radeon GPU - will work at 2666MHz. Any higher and if supported by the RAM (it is) in your particular hardware configuration is only achievable by enabling OC in the motherboard, i.e., "auto" settings, the default, can't be ised. How to do that should be explained in the user's manual.2nd Gen AMD Ryzen™ and 3rd Gen AMD Ryzen™ with Radeon™ Graphics Processors
2 x DIMM, Max. 64GB, DDR4 3600(O.C.)/3466(O.C.)/3400(O.C.)/3200(O.C.)/3000(O.C.)/2933/2800(O.C.)/2666/2400/2133 MHz Non-ECC, Un-buffered Memory *
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