Specify CAS Lantency

[Roshen]

I found that this model (GSkill F3-10600CL9S-4GBNT) has a CAS Latency of 9-9-9-24-2N.
My RAM (Adata AD3U1333C4G9-B) has a CAS Latency of 9-9-9-24.
.
Here are my questions,
Why 3 nines?
What is 24?
What is 2N?
Why doesn't mine have 2N?
.
Thank you!

 

[MarkW]

The 9's are pretty much refresh, read, write times.
24 is the reset time basically.
2N is how many of those cycles per reset.

All memory has the 5th part. Normally it is specified at 1T or 2T. And many times, its not specified at all. But it is there. Part of why that is, is that those 4 or 5 parts are a tiny fraction of all of the timing settings each stick of memory actually has. There are literally dozens of settings. That is why we tell people that mixing memory is a crapshoot. You could be the big winner, or the big loser, or it might act like you are the big winner for a while, and then lockup without warning. And it is the memory controller that makes that decision.

That is severely over-simplifying things, but that's the basics.