"I think you are misunderstanding the data. The CL22 is 3200MHz, rated by Micron. All of the others are lower speed RAM, and have lower CAS latency for about the same CAS delay. The CL 22 is the most expensive on the list, and could run at any of those latencies at the same speeds"
"This is total bullshit. This reference (MT40A2G4SA-062E) has a speed of 3200MHz. CL22 is indeed slower than CL13 but the CAS Latency isn't the whole story. In fact, higher clocked memory kits tend to be more expensive: Apple took the second most expensive in this case"