  This paper represents a detailed theoretical study of the role of the
longrange magnetic dipole-dipole interaction evidenced by the ferromagnetic
resonance (FMR) spectra for the ordered arrays of cubic nanoparticles. We show
that the size of the array essentially controls the stability of the system,
allowing to suppress the intermittent low-field excitations starting from the
arrays formed by 6x6 nanoparticles. Our numerical simulations allow to
determine the threshold inter-particle distance (around 80 {\div} 100 nm),
after which the dipole-dipole interaction becomes negligible so that the FMR
spectrum of the nanoparticle arrays becomes the same as the spectrum featured
by a single nanoparticle. We also compare our simulations with experimental
FMR-spectra of 24 Fe/Fe$_x$O$_y$-nanocubes irregularly placed on a substrate.
