FredeGail:
Here's the scoop on RAM timings:
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Take the latency ((CAS) and multiply it by 1000) / (RAM speed /2)
This will give you the response time in nanoseconds.
So for example, a certain DDR3-1866 module of Kingston HyperX memory has a CAS latency of 11 while G.Skill makes a DDR3-1600 module with a latency of just 6. The result?
G.Skill’s slower RAM can respond in just 7.5ns where it takes the much faster HyperX RAM 11.7ns. This means that the G.Skill memory will be faster when it comes to random access; however, the higher clock speed of the HyperX memory still nets it more bandwidth, making it better suited for bulk operations.
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Use this for your RAM speed decisions.
Note: I found this on a Google search quite a long time ago. Use common sense.