8GB KIT (2 x 4GB) For Samsung R Series R540-JS0A R540-JS0B R580 R580-11 R580-i5-430 R580-JBB2 R580-JS01 R580-JS02AU R580-JS03 R580-JS05AU R580-JS06AU R580-JS07AU R580-JSB1US R580-JT01AU R580-JT02AU R580-JT04UK R590 R590-JS02AU R710 (DDR3) R710-AS02 R730 (HM55 Chipset) R780 R780E R780-JT04UK R780-JT4BUK R780-Red RC510 RC710-S02UK RC720. SO-DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech 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 Samsung R Series. (See Compatibility List Below)