CAS latency of ram

I came across 2 products which i would like 2 buy.They have same config except for CAS latency.I don't know what they do.I plan on setting up 24gb tri-channel.

Which CAS latency is the best
1) 9-9-9-24-2N
2) 7-8-7-24-2N

Can i overclock this ram to 2000MHz.Could you please help me find this model

Thanks.Counting on you guys...
2 answers Last reply
More about latency
  1. If you are going to OC,then go with the second one,it has lower timings which are better for OC'ng.
    None one can tell you how far you can OC it,but you should get good results out of it.
  2. thanks a lot
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