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Kingston Technology HyperX 4 GB Kit (2x2 GB Modules) 4 Dual Channel Kit 1600 (PC3 12800) 240-Pin DDR3 SDRAM KHX1600C9D3K2/4GX at Amazon.com
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A-Tech 4GB RAM Replacement for Kingston HyperX KHX1600C9D3/4G | DDR3 1600MHz PC3-12800 1Rx8 1.5V UDIMM Non-ECC 240-Pin DIMM Memory Module at Amazon.com
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Refurbished: HyperX 4GB 240-Pin DDR3 SDRAM DDR3 1600 Desktop Memory Model KHX1600C9D3/4G Desktop Memory - Newegg.com
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