Assuming a standard ATX mounting, for simplicity let's call it 0.25" for standoffs, 0.25" for the motherboard tray and another 0.25" for the motherboard itself (likely thinner than 0.25") and 0.50" for cable management, that would leave 6.35" for a cooler (a little less, as I'm assuming the 7.6 came from external measurements). In theory, that's more than enough (the 212 needs 6.26"). Whether it is in practice, depends entirely on the case in question.