Hey, so my question is that in which RAM slots do I have to put the RAM sticks in on the B450M Pro4 motherboard? As a CPU I have the Ryzen 5 2600, and in the manual it doesn't say anything about 3000mhz RAM.
Usually it's the 2nd and 4th slots, counting away from the CPU, that should get the DIMM's of a two-DIMM kit to allow for proper termination of the data lines. That provides both dual channel and best clock speed capability.