Before testing OCZ PC2-5400 I was curious if we would see any performance gain jumping from PC2-4200 (533Mhz) to PC2-5400 (667Mhz). The fact is that in most benchmark software, OCZ PC2-5400 performed better than stock PC-4200 memory, even it had higher CL timings. Unfortunaly no laptop offers advanced settings to lower timings that would further boost performance gain. During gaming testing, we didn't witnessed any serious performance gain between PC2-5400 and PC2-4200 configurations that made us troubled... Probably the higher timings of CL5 doesn't offer much help to see gaming difference, where probably, faster HDD or CPU would help.
We tried OCZ's PC2-5400 at several laptops and didn't had any in-compatibility issues which showed OCZ promise to deliver trouble-free products. An interesting configuration would be 2GB of DDR2 667, which might offered most benefits with latest games. At any case, OCZ proposal for laptop users offers the highest memory speeds with the appropriate performance gain.