For Intel, one part of the UEFI BIOS is the MRC- Memory Reference Code. There are POST codes related to this that you can find. This code performs the DDR3 /

For Intel, one part of the UEFI BIOS is the MRC- Memory Reference Code. There are POST codes related to this that you can find. This code performs the DDR3 / DDR4 initial calibration described in the article. There is "rank margin test" mode for it, to determine the eye width for each pin. To validate a population of DIMMs, this code should be run over temperature.