http://routerboard.com/RB750Gr2
http://routerboard.com/RB2011UiAS-RM
http://wiki.mikrotik.com/index.php?title=Manual:Maximum_Transmission_Unit_on_RouterBoards
What details are you missing?
Max L2MTU details!
Both RB2011 series and RB750G is in the list
http://wiki.mikrotik.com/index.php?title=Manual:Maximum_Transmission_Unit_on_RouterBoards#MAC.2FLayer-2.2FL2_MTU
http://wiki.mikrotik.com/index.php?title=Manual:Maximum_Transmission_Unit_on_RouterBoards
Says RB411 series ether1:1526 but so far I have only seen 411’s boards with a max L2MTU of 1520?