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Better, yes. But not drastic. They've improved efficiency slightly almost every model (DM4/5/C all same) since DYE has owned the rights to the Matrix. 6 was slightly better, 7 yet, 8 again, 9 still. While the DM9 is most definitely the most efficient Matrix ever made, it's not amazing improvements over the DM8 or 7. And the amount I hate it's eyes overrule any amount of improved efficiency IMO. But that's just me.
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