Mushkin 990906 DDR1 SODIMM 512MB PC2100 SODIMM 200p 2.5-3-3-6 NONE 2.5V Compatible Frequency This product is engineered to operate at the optimum frequency for compatibility with your system. Compatible Timings This product is programmed to use timings that offer maximum compatibility with your system and original memory. Quality guaranteed - we offer a on this product and genuine, unmatched service and support. Type: DDR SODIMM Voltage: 2.5V Speed Spec: PC2100 Frequency: 266MHz Capacity Kit Type: Module Module Size: 512MB Timings tCL: 2.5 tRCD: 3 tRP: 3 tRAS: 6 Cooling Technology Heatsink: None