Crucial CT51264BC1339 RAM Module - 4 GB (1 x 4 GB) - DDR3 SDRAM 1333 MHz...
When you buy Crucial memory, you're buying directly from the largest DRAM manufacturer in America and one of the top three in the world.
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As low as $42.40
User Review: Bought 1 stck just to try in my HP Dm4 core i5. Took it from 4GB to 6GB, left 2GB in from HP.