What are the differences in terms of performance by running/setting ram to a cas latency of 2 as opposed to 2.5 (DDR 2100)? I heard that CAS 2 ram will only show differences when opening a program, for example, but once the program is opened, or application, the two types run at the same speed. This isn't a big deal to me whether a program opens a 1/2 millisecond faster than the other. I don't know if this is the only advantage.