Here, see this: http://www.corsairmemory.com/corsair...707/index.html
I learned most of the things I know about RAM by watching that flas movie
Report back if that helped you! :bald:
Also, the whether one clock cycle diffrence will be noticed or not depends on the clock's speed, if the clock speed is REALLY REALLY high, then the time that it will take untill one clock cycle will pass will be very short, but for the moment there is quite a diffrence even if its just 1 cycle, but its not catastrophical anyways.
I guess this is all about my advise to you to take the Cas3 instead Cas4? [Although I shown you both, told you to decide what fits your budget better]