The Qimonda HYS64T64000HU-3.7-A 512MB DDR2 RAM includes two sticks, each with a total capacity of 512MB, providing a combined total of 1GB memory. With a bus speed of PC2-4200 (DDR2-533), this memory module offers reliable performance for your computing needs. Featuring ECC memory, it ensures data integrity and reliability during operation. Ideal for upgrading your computer's memory for improved speed and multitasking capabilities, this DIMM module is a great choice for enhancing your system's performance.