[M] Patriot Viper Steel DDR4 16GB 2666MHz 2x16GB CL18 SODIMM Memory Review
 

The mainstream Viper Steel 2666MHz kit does trade punches in terms of performance with the Silicon Power model and was proven to provide a really stable system during the intensive benchmarks. The lower CAS latency does not seem to make a very big difference because in the case of laptops we do not have a lot of flexibility for configuration and all is dependent on how the manufacturer BIOS was written.

http://www.madshrimps.be/articles/article/1001263/