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
G.Skill Ripjaws 4GB DDR3-L 1600 BUS Notebook RAM
G-Skill 4GB Ripjaws X DDR3 1600 Dual Kit - Red : Amazon.co.uk: Computers & Accessories