Idk what any of this means

[spritbits]

I have a asrock g41c-gs and for the voltage there is dram voltage ik what that is idk what NB voltage , vtt voltage, gtlref voltage can anyone explaine thoes to me

 

[CountMike]

DRAM = RAM = memory
NB = North Bridge = part of CHIPSET, in control of CPU, RAM and internal communication between them.