G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin SDRAM (PC3-12800) DDR3 1600 CL10-10-10-30 1.50V Dual Channel Desktop Memory Model F3-12800CL10D-16GBXL at Amazon.com
NeweggBusiness - G.SKILL Ripjaws X Series 16GB (2 x 8GB) DDR3 2133 (PC3 17000) Desktop Memory Model F3-2133C9D-16GXH
F3-2133C10D-8GXM - Overview - G.SKILL International Enterprise Co., Ltd.
G.Skill Ripjaws X 32 GB (4 x 8 GB) DDR3-2133 CL9 Memory (F3-2133C9Q-32GXH) - PCPartPicker