In light of the recent benchmarks, a little bit about RAM speeds.

I'll start by saying this:

CAS latency isn't an accurate measure of memory performance.

Memory performance is all about the relationship between speed and latency. It is important to remember that CAS latency (or CL for short) is not the definitive way to quantify the speed.

I highly reccommend the full article here however here is a summary:

At a basic level, latency refers to the time delay between when a command is entered and executed. It's the gap between the two. Because latency is all about this gap, it's important to understand what happens after a command is issued. When the memory controller tells the RAM to access a particular location, the data must go through a number of clock cycles in the Column Address Strobe in order to get to its desired location and “complete” the command. With this in mind, there are two variables that determine a module's latency:

1. The total number of clock cycles the data must go through (measured in CAS Latency, or CL, on data sheets)

2. The duration of each clock cycle (measured in nanoseconds)

True Latency = CAS * Clock Cycle Time

Based on the chart in the whitepaper, I have estimated some timings for 3200, 3600 and 4000.

*I was a bit off, someone has linked the timings HERE but the calculation is the same.

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Important things to note:

1. don't rely solely on a low CAS giving you the best performance.

2. Don't be put ofF higher clocked memory because of the high CAS, 2666MHz/CL17 is faster than 2133MHz/CL14.

I personally am going to be picking up a 3600MHz/CL16 4x8 kit, and hopefully an R7 1800x or R7 1700X.

**Okay, so taking a look at the memory timing examples I am trying to list the best Clock Rate/CAS 1-10 by lowest overall latency; I think this is a fairly good way of doing it but I am sure someone will correct me. http://imgur.com/a/fNfc7

I am fairly certain that 3200MHz/CL14 is the best value for performance.

Best latency hands down goes to 3600MHz/CL15, followed by 4266MHz/CL19.