ASROCK Fatal1ty FM2A88X+ Killer Series User Manual page 57

NB Load-line Calibration
NB Load-line Calibration helps prevent NB voltage droop when the
system is under heavy load.
GFX Engine Clock
Use this to adjust GFX Engine Clock. The default value is [Auto].
DRAM Timing Configuration
DRAM Frequency
If [Auto] is selected, the motherboard will detect the memory module(s)
inserted and assigns appropriate frequency automatically.
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