My motherboard has 4 slots (dual channel). I currently have 2x4GB of DDR3-1600 RAM and I want to add another 2x4GB sticks, also DDR3-1600 in order to get 16GB of RAM. The thing is, my current RAM has a CAS Latency of 8, with timing 8-8-8-24, and to get a similar kit with CAS Latency of 9, timing 9-9-9-24 would be significantly (almost twice) cheaper than getting the exact same RAM that I have now. Will I lose performance/stability with the CAS 9 RAM, or should I stick with another CAS 8 RAM? I'm also looking at a third kit, which has CAS Latency 7, timing 7-8-8-24, is that an option too? I don't understand how RAM works internally so I don't know what I can mix and match.
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