This sale is for 2 x 1GB ( 2gb kit )SUN/Oracle memory under the SUN part number 371-1899. These are listed for the Sun Enterprise M4000/M5000 servers, but can probably be used under any generic platform. The memory was made by Qimonda under the Manufacturer number HYS72T128000HP-3S-B and has the description of 1GB, 1Rx4, PC2-5300P-555-12-HO. All parts come with a NON-DOA warranty. Buyer is responsible for researching all compatibility issues with regards to this memory. No returns for memory that does not work due to incorrect compatibility, so please research prior to purchasing.