Crucial 4gb ddr3 1866 dr x8 vlp rdimm 240p memory product description crucial ddr3 4 gb dimm 240 pin product type ram memory capacity 4 gb memory type ddr3 sdram dimm 240 pin very low profile upgrade type generic data integrity check ecc speed 1866 mhz pc3 14900 latency timings cl13 features dual rank registered voltage 15 v manufacturer warranty limited lifetime warranty