The Hynix HYMP564S64BP6-Y5 512MB DDR2 Laptop RAM Memory is a single module designed for laptop computers. With a total capacity of 512 MB and a bus speed of PC2-5300S, this DDR2 SODIMM module offers reliable and efficient performance for your computing needs. The Hynix brand is known for quality and stability in memory products, making this RAM module a dependable choice for enhancing your laptop's speed and multitasking capabilities. I am seling two as shown, they are untested.