PSD comparison of solar RVs taken with the HARPS-N telescope (black, 430 days) and synthetic RV extracted from 3D MHD simulations of solar granulation (light blue, 2 days). The averaged periodogram of the 26 MHD two-day time series is shown in dark blue. Period ranges dominates by high-frequency noise (instrumental and oscillations), granulation, supergranulation, and magnetic activity are indicated with gray, red, yellow, and green arrows. The dotted red vertical line indicates the period limit (~5 hours) within which the PSD is no longer dominated by the granulation noise.