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Optiplex 990 supported memory speed

I have a optiplex 990 and I wanted to verify the supported memory speeds.
all the documentation I have found only says DDR3, 1333MHz with up to 16GB with all 4 slots used.
but when looking for compatible memory upgrades crucial.com lists DDR3 at 1600MHz.
where can I find all the memory speeds that this machine supports?

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