OWC 4GB DDR2 800 PC2-6400 CL6 2Rx8 200-pin 1.8V Non-ECC SODIMM Memory RAM Module Upgrade for Select Laptops or All-in-One Systems. CAS Latency: 6; Voltage: 1.8V; Buffered/Registered: Unbuffered; Part Number: 6S4D22R804GB; Model #: OWC6S4D22R804GB-B962-SF $