Actually after typing the above I double checked and it's clearly stamped on the board as well "DDR 3 1666+"
So maybe the cpu only offiicially supports ddr 3 1333 however you can run at higher via Ocing?
Quick guess but to compete with 1066 @ 5-5-5-12 1666 would need to run 8-8-8-24 If the memory controller can handle it.
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