12th Generation Intel® Core™ Processors Datasheet, Volume 1 of 2
System Memory Frequency
In all modes, the frequency of system memory is the lowest frequency and latency of all memory modules placed in the system, as determined through the SPD registers on the memory modules. The system memory controller supports a single DIMM connector per channel. If DIMMs with different latency are populated across the channels, the BIOS will use the slower of the two latencies for both channels. For Dual-Channel modes, both channels should have a DIMM connector populated. For Single-Channel mode, only a single channel can have a DIMM connector populated.