Kingston Desktop Memory Module - 4GB, DDR4, 288-pin DIMM, 2133MHz/PC4-17000, CL15, Non-ECC, Unbuffered, Single Rank, 1.2V - KCP421NS8/4 at TigerDirect.com
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A-Tech 4GB RAM Replacement for Kingston KCP421SS8/4 | DDR4 2133MHz PC4-17000 1Rx8 1.2V SODIMM 260-Pin Memory Module at Amazon.com