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Patriot Viper Xtreme Series Division 2 Edition DDR3 8 GB PC3-12800 1600MHz 8 -9-8-24 for Intel P67 Using Core i5 Core i7 Memory Modules PXD38G1600LLK at Amazon.com
AddOn 24GB Industry Standard DDR3-1600MHz UDIMM Kit DDR3 - kit - 24 GB: 3 x 8 GB - DIMM 240-pin - 1600 MHz / PC3-12800 - unbuffered - non-ECC
OCZ AMD Black Edition DDR3-1600/PC3-12800 4GB Kit OCZ3BE1600C8LV4GK Memory Review Benchmark values and test results