Memory system and operations of the same

A method by a memory system, comprising:

• receiving, over a first channel, a first signal including command and address information for a set of data stored in the memory system comprising a first memory device configured for one or more access operations according to a first energy-per-bit rating and a second memory device configured for storing information according to a second energy-per-bit rating;
• determining whether the set of data is stored in the first memory device based on receiving the command and address information;
• and
• transmitting, over a second channel, a second signal comprising the set of data based on determining that the set of data is stored in the first memory device.

An apparatus, comprising:

• an array of memory cells having a first density and a first energy-per-bit rating;
• a first interface configured to communicate a first set of signals between the array of memory cells and a host device;
• and
• a second interface configured to communicate a second set of signals between the array of memory cells and a memory device configured for storing information and having a second density of memory cells and a second energy-per-bit rating.