8GB should be fine. I'd say just upgrade to the 1050Ti (without any power pin connectors) to ensure you don't get a card your power supply can't accommodate. Or you can look for the connectors or let us know what power supply you have to see if you can add a powered card to the mix. But for most people, the 1050Ti will be good for a few years at 1080P. Good cost on the card, too.