12th Generation Intel® Core™ Processors Datasheet, Volume 1 of 2
DDR Electrical Power Gating
The DDR I/O of the processor supports Electrical Power Gating (DDR-EPG) while the processor is at C3 or deeper power state.
In C3 or deeper power state, the processor internally gates VDDQ and VDD2 for the majority of the logic to reduce idle power while keeping all critical DDR pins such as CKE and VREF in the appropriate state.
In C7 or deeper power state, the processor internally gates VCCSA for all non-critical state to reduce idle power.
In S3 or C-state transitions, the DDR does not go through training mode and will restore the previous training information.