Well the one I sent you was to answer a specific question regarding my 2400 cas 9 sticks. Some guy a few weeks ago was trying to assert his 1600 cl7 sticks were faster than my 2400 cl9. It wasn't meant for general consumption. This one uses 1600 cas 9 as the baseline.

1000/(freq/2) is the same as cycle time. So you already know that part, you've just seen it before in a different from. Bit time is the time needed to send a word after the first already is sent. So it's for sequential transfers.

The second chart equation can be broken into two halves. (cas)x(cycle time) is the time needed to get only the first word. And then the second part +((1-ammount of words)x(bit time)) is the rest of the request. Since we already sent the first word, we have to subtract one. Then we multiply the number of remaining words by the bit time, since the ram can pump out sequential bits a lot faster than random.

Keep in mind, this chart and equation is incredibly simplified. This assumes the row is already selected. However I still think it's a good indicator of ram performance.

as for command rate. that doesn't enter into this chart because one of the assumptions is that the row is already selected. bank selection would happen before we get to this point.

I know that wasn't very clear, but I hope that made sense.