The remarkable correlation between D3(BJ) and a genuine dispersion energy is reminiscent of ALMO-EDA2 when the HF-PBE functional is used to extract E disp from a PBE0+D3(BJ) calculation. Together, these data suggest that not much of PBE or BLYP correlation actually accounts for dispersion, which is consistent with the purely repulsive potential energy profiles that these functionals often afford for dispersion-bound complexes (Fig. ). Weaker interrelation between SAPT(DFT) dispersion and the D3(BJ) correction for hydrogen-bonded complexes reflects the fact that hydrogen bonds are associated with reduced intermolecular separation as compared to dispersion-dominated complexes (at equilibrium geometries), thus D3(BJ) is more strongly damped in hydrogen-bonded geometries and the XC functional must account for dispersion to a more significant extent than is required at the larger intermolecular separations representative of purely dispersion-bound complexes. At large separation, D3(BJ) does resemble genuine dispersion.