Have amd athlon 2x4 620-2.60 ghz and amd phenom 2x4 with Dual ddr2 1066 with two slots ddr2 empty.cant tell if phenom is 920.It says black series.Would like to add 2X2 GB G SKILL 1066 STRIPS TO OTHER TWO SLOTS.Do I need to do anything other than shutdown,add strips,and then restart system. thks