  Extensive dynamical simulations of Restricted Solid on Solid models in
$D=2+1$ dimensions have been done using parallel multisurface algorithms
implemented on graphics cards. Numerical evidence is presented that these
models exhibit KPZ surface growth scaling, irrespective of the step heights
$N$. We show that by increasing $N$ the corrections to scaling increase, thus
smaller step-sized models describe better the asymptotic, long-wave-scaling
behavior.
