I'm a bit confused about what latency RAM to buy. I see CL9, CL10 and CL11 available. Presumably the lower the number the better, but they say that means more heat. The iFixit teardown shows that Apple is putting C11 in the smaller iMac -- but I assume it's anyone's guess at this point what they will put in the 27".
I've ordered my 27" with the stock 8Gb, and I plan to buy two 8Gb SODIMMS to bring it up to 24Gb. At the end of the day, does it really matter if the two I buy have a different latency than the RAM it comes with, or should I wait until I get the machine and match the latency?