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The Samsung website is not very useful in telling the difference. After hours of study, here are the differences I found: 9770: Max tempt on bake is 570F. Has steam proof mode for bread. Has 2 year warranty and gets you the in-home demonstration of how to use it and special phone support number (because it is in Chef's Collection). Has two sliding racks in bottom oven. Flush mount or standard install. Weight is 280 pounds. This has to be a misprint -- no way this is that much heavier than the 7770. 7770: Max temp on bake is 550F. Has proof mode (no steam proof). Has 1 year warranty. Has 1 sliding rack in bottom oven. Standard install. Weight is 135 pounds.
Sorry, there was a problem. Please try again later.Hello CarlW, I have attached a link below to the specifications of each unit. https://www.samsung.com/us/home-appliances/wall-ovens/microwave-combination-oven/30-microwave-combination-chef-collection-oven-with-flex-duo-nq70m9770ds-aa/?redir=NQ70M9770DS#specs https://www.samsung.com/us/home-appliances/wall-ovens/microwave-combination-oven/30--microwave-combination-wall-oven-with-flex-duo--nq70m7770ds-aa/?redir=NQ70M7770DS#specs ^Britt
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