RAM timings and CAS latency

Could someone explain to me what these are and how they are measured >_>? I've read that a lower CAS latency is generall better since it is the time it takes for the RAM to read through one cycle of data...though if the amount of data read per cycle is too low, a low latency is still bad. Can anyone explain on the timing too? 4-4-4-12? 5-5-5-15? What? lol

Thanks :-D

 

Google RAM timings if you want an accurate answer.

But it basically refers to how many RAM clock cycles are needed to perform execute various commands. Some are executed more often than others (For example, selecting a row can be done once, after which, you can typically read through lots of columns on that row), and some can get a "head start", so it doesn't matter that they take longer.

But yes, basically, lower latencies are better. And the first number is the most important one. (The CAS latency)

 

Ok..so lower is better. That pretty much sums it up hahah. Thanks, I'll google it heh