There are a number of different synonyms for "hi tech" that you can use depending on the context of your writing or conversation. If you are referring to technology that is new and cutting-edge, you might use terms like "state-of-the-art," "cutting-edge," or "advanced." Other potential synonyms for "hi tech" might include "modern," "innovative," or "technologically advanced." Ultimately, the exact synonym that is most appropriate for your needs will depend on the specific situation at hand. However, with so many different options available to choose from, you shouldn't have too much difficulty finding a phrase that suits your purposes perfectly.