Both the MBE(2) and MBE(3) approximations at the ωB97X-D/def2-SVPD level afford sub-kcal/mol error with respect to supersystem results using the larger def2-TZVP basis set, suggesting that the basis-set incompleteness error is < 1 kcal/mol. MBE(3) achieves this feat without a supersystem correction, inclusion of which scarcely alters the results, whereas the supersystem correction does afford a small but noticeable improvement to MBE(2). It is worth noting that the supersystem ωB97X-D/def2-TZVP calculation on this 632atom model consists of 11,767 basis functions and requires an aggregate computation time of 17,546 h running on a single 40-core node.