A-TECH 8GB KIT (2 x 4GB) For Dell Studio 1450 1457 1458 1458/1457 15 (DDR3) 1558 1569 17 (DDR3) 1745 1747 1749. SO-DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory. Genuine Brand. 8GB KIT (2 x 4GB) SO-DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Studio. (See Compatibility List Below)