Possible values of an option:
Depend on memory type, there can be a variant [Auto]
The option description:
Establishes time of a preliminary charge on RAS (parametre tRP in the access diagramme). For SDRAM there are enough  steps but if the computer works astably, it is better to increase this value to . If to speak about DDR SDRAM the delay usually makes the same  or  steps. For DDR2 SDRAM values from  to  steps, and for DDR3 SDRAM — from  to  steps are characteristic. Can be present and a variant [Auto] (the information undertakes from microcircuit SPD).
Other options identical to destination: