GPU recommendation

My gigabyte z370n mini itx htpc build is running perfectly fine. But i'd like to add an dedicated gpu for casual steam gaming. (No AAA titles. Mostly indy and retro games). Any change i can put a deidcated gpu which does not need more power than my 150w psu can supply? I'd also like to maintain my ultra quiet setup if possible (when not running games). Which models do u suggest if any?

submitted by /u/fussballbundesfahrer
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