PL = performance level : it's a setting that influences the rambandwith, latency, it's value is dependant on the ram you use, type , amount, FSB selected : in fact the lower the better : Expect with this board around 9-10 with 1:1 divider, 7-9 with a divider (eg 3:4,...)... try to get the lowest value for best RAM performance

LLC = Load Line Calibration : eliminates Vdroop/drop so setting in bios corresponds with the voltage value given to the CPU under idle/load. To clarify an example :
In bios set 1.4, without LLC it will be around eg 1.37 in Windows at idle, around 1.34 under load... With LLC enabled you set 1.4 and it should give 1.4 under load and idle... I said should as this board slightly tends to overvolt under load with LLC enabled...

Hope it's is somewhat clear, I don't use magical technical terms as I don't understand them and mostly neither of you...