A-TECH 8GB KIT (2 x 4GB) For Dell Studio 1457 1458/1457 15 (1557) 15 (1558) 15 (1569) 1745 1747 1749. SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory. Genuine Brand. 8GB KIT (2 x 4GB) SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Studio. (See Compatibility List Below)