I have a Lenovo Thinkpad T430 that I configured with 4 gigs of RAM (budget constraints at the time). It is in single channel (Lenovo never mentioned this tidbit of info; the sad part is both my wife's and daughter's 1st Generation Thinkpad Edge came with 4 gigs of dual channel at 7 timings). My CAS Latency is currently 11. I am wanting to double the RAM to 8 gigs dual channel and I have the option of CAS Latency at either 9 or 11. This laptop is used for business such as Office work, internet, email, streaming video, etc. In real world applications would I even notice the difference between my system running either 9 or 11 timings? Thanks.