20gbit Port-channels using sfp+ ports

Hi,
I am hoping to implement a cost affective solution that can utilise the uplinks ports on the 2960-X & XR series switch and the appropriate up/downlink modules for the 3750-X series switch
Would anyone know if it is possible to bundle the 10gbit sfp+ ports into a 20gbit port-channel?
Has anyone done this or could they point me in the right direction for documentation?
Thanks

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BTW, don't forget, you only have two 10g ports per 3750X.

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20gbit Port-channels using sfp+ ports

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