cl8

Hey guys upgrading my PC to sandy bridge. I hav decided on, CPU : Intel i5 2500K Mobo : Asus P8Z68-V RAM : Ripjaws X Series 8GB CL8 or Vengeance 8GB CL9 (Vengeance in stated as only XMP qualified RAM, Ripjaws X is CL8, which is ideal for gaming n OCing?)(CL8 vs CL9) Which RAM sticks to get...