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DRA821U: DDR frequency is 2666?

Part Number: DRA821U

in the releasenote of SDK(RTOS), DDR should be configured to 2666MHZ


but in the reference design ,the DDR's  type is MT53D1024M32D4DT-046 AAT. It's maximum frequency is 2133

and in the default setting in SDK&EVM, it's also 2666,

Why are the recommended values inconsistent with the reference design?