The main differences are: The DTG 5078 supports up to 8 output modules or 32 channels with a maximum data rate of 750Mb/s. The DTG 5274 supports up to 4 output modules or 8 channels with a maximum data rate of 2.7Gb/s. The DTG 5334 supports up to 4 output modules or 8 channels with a maximum data rate of 3.35Bb/s