depends on the rest of your system.... i had cas 8 on my 1600 ram and with benches and performance it wasn't as good as my cas 9 at 1872. I have a sandy bridge rig and it seems to like clock speed over latency.
So it depends on your entire system... you can use sisandra or maxxmem to make sure though. Test it at both settings.. Mine preformed better at 1872 cas 9
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