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Heavy-ion collisions at intermediate energies are studied by using a new relativistic quantum molecular dynamics (RQMD) code, which is a covariant generalization of the quantum molecular dymanimcs (QMD) approach. We show that this new implementation is able to produce the same results in the nonrelativistic limit (i.e., 50 MeV/nucleon) as the noncovariant QMD. Such a comparison is not available in the literature. At higher energies (i.e. , 1.5 GeV/nucleon and 2 GeV/nucleon) RQMD and QMD give difFerent results in respect to the time evolution of the phase space, for example for the directed transverse How. These differences show that consequences of a covariant description of heavy-ion reactions within the framework of RQMD exist even at intermediate energies.PACS number(s): 25.70.z, 24.10.3v, 02.70.Ns

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