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G.SKILL Ripjaws X Series 4GB (2 x 2GB) DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBXL Desktop Memory - Newegg.com
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G.Skill Ripjaws X 8GB (2 x 4GB) DDR3-1600 PC3-12800 CL9 Dual Channel Desktop Memory Kit F3-12800CL9D-8GBXL - Red - Micro Center
G.Skill 8GB (2 x 4GB) Ripjaws V Series 288-Pin DDR4 SDRAM DDR4 2400 (PC4-19200) Intel Z170 Platform/Intel X99 Platform Desktop Memory Model F4-2400C15D-8GVR at Amazon.com