Crucial 1GB DDR2 SDRAM Memory Module1 GB of memory to refine your computer's performance200-pin-pin DDR2-533/PC2-4200 operates at up to 400 MHz data bus speed with minimal power consumption and as a result, you get optimal computer performance with an improved memory heat dissipation533 MHz memory speed with Unbuffered signal and CL4 latency for great multitasking capability