Hello, the description for my laptop is in my signature. I currently have 8GB of RAM in my laptop and am looking to purchase another 8GB. Newegg.ca seems to have great prices however when it comes down to the actual memory I am not sure which one to buy. Is a cas latency of 9 noticably better than a cas latency of 11? Is it worth the price stated in the links? Here is a comparison of four options by newegg.ca: Newegg.ca Comparison Do you think it is worth it to buy the more expensive one? Also, above all, will these RAM modules work with my laptop?