Those are the RAM timings. The higher they are the looser they are, the lower the tighter. Lower numbers mean better performance like higher MHz (speed) means faster performance. The higher the MHz, the lower the timings, the better the RAM generally speaking. That isn't always the case though. RAM voltage on Intel rigs (Core i specifically) is limited to 1.65V of you are taking a risk at damaging the IMC (Memory controller) which is built into the CPU. This being said, lowering timings on a kit already set to 1.65v could become unstable which would result in lower performance due to compensation, or just a simple crash.
Truth be told, anything past 1600MHz 9-9-9-24 is minimal gains and wont really be seen in real world performance due to memory bandwidth being so high compared to todays tasks. Just what happens when computers start getting so fast.
The difference between the 3 you named off is simply an extension to the set of timings. In other words, they all mean the same just one is showing another number in the set. 2N is also called 2T. Back in DDR days you wanted that number to be 1 as it is your main cas latency. Typically DDR3 kits are 2 which is normal. Faster kits in the 2133+ area are usually 3T but can mostly be run at 2T even at those speeds.
If you want a more thorough explanation check this link out.
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