Predicted CMD diagrams for galaxies hosting AGN with X-ray luminosity L_X> 10^42.2 erg s^-1 on three redshift bins are compared with the data from the COSMOS catalogue (Bongiorno et al. 2012, diamonds) and from Aird et al. 2012 (green triangles). Top panels refer to the DI model, with the predictions for the fiducial case (α = 10) represented by the solid contour plot, while the grey dashed contour plot refers to the case α = 2. Bottom panels refer to the IT scenario.