DRAM Timing tRP
Possible values of an option:
Depend on storage type, there can be a variant [Auto]
The option description:
Installs time of a preliminary charge on RAS (parameter tRP in the access chart). For SDRAM there are enough  clock periods but if the computer works unstable, it is better to increase this value to . If to speak about DDR SDRAM the time delay normally makes the same  or  clock periods. For DDR2 SDRAM values from  to  clock periods, and for DDR3 SDRAM — from  to  clock periods are characteristic. Can be present and a variant [Auto] (the information undertakes from chip SPD).
Other options identical to destination: