Crucial Ballistix Sport 8GB Kit (4GBx2) DDR3 1600 MT/s (PC3-12800) CL9 @1.5V UDIMM 240-Pin Memory BLS2KIT4G3D1609DS1S00
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http://www.amazon.com/dp/B006WAGGUK/ref=pe_385040_127541850_TE_item