1)better cable management with modular.
2)best balance
ripjaws X at smc -
Gskill Sandy Bridge 8GB 1600Mhz DDR3 4GB X 2
G-Skill[ Ripjaws-X ] F3-12800CL8D-8GBXM
(the second one is CL8)
they also had the 4gb one but now not listed on their site. you may call them
yes even ordinary ripjaws will do