CDR info
"There is no question about memory compatibility, since the DDR2-800 memory modules will work just fine at 667MHz in every laptop. Moving on to our tests, OCZ got first place. Looking at the test results in greater detail, we can see that upgrading your laptop's memory from 1GB DDR2-533 to 1GB DDR2-667 does offer an improvement in the overall performance as most tests showed. Adding a second 1GB of DDR2-667 is a good idea also (total 2x1GB), since this affects memory bandwidth in most tests. Ending this roundup, we are satisfied with the performance of the memory modules from OCZ."

Tech Insight Magazine
“OCZ Technology’s 4GB PC2-6400 memory kit is your answer to both cost concerns and performance demands. Whereas most enthusiast-oriented desktop modules require extra voltage to keep them running in high-performance configurations, OCZ is able to get its PC2-6400 kit dialed in with CAS 5 timings and 1.8V - the official DDR2 standard. That the OCZ kit delivers 4GB right out of the gate puts your builds on par with many desktop PCs.”