Arch Memory 4 GB (1 x 4 GB) Certified for Dell 240-Pin DDR3 UDIMM SNPP382HC/4G A2578593 RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 4GB DDR3-1333 PC3-10600U 240-Pin UDIMM 1.5v Dual Rank (2Rx8) Non-ECC Unbuffered 1333Mhz Lifetime Replacement Warranty Included