whats pll and vtt voltage?

[NoobieOCer]

hi i recently gotten a DFI p45 JR board and thought i try and push my good old dual core again but first time i had acess to PLL and VTT voltages.


i did some research and it seems VTT can help clean up the voltage at high vcore. but what is PLL. and when should i consider raising these voltages?

should i raise them when increasing v core doesn't stabilize the oc?

also a bunch of other voltages like FSB and NB and SB, should i just leave these untill i get over 400 FSB?

edit- just found PLL and SB vcore is the same thing in my bios.