Installed 1600 RAM since it was cheaper than 1333 (go figure)
Latency of the 1333 that was in the system was 9-9-9-24
Latency of the 1600 that is new is 8-8-8-21
So running the 1600 at a lower than spec freq it was detected and runs great at a lower latency than 1333 did.
I have zero manual control over RAM settings with this MB so this is all via JEDEC/SPD tables.
Very happy that I couldn't find 1333 memory from a name brand cheaper