Buying new Windows 10 computer but don’t want to overspend on laptop graphics capability since will not use laptop screen alone very often. I should save money by getting 13.3” vs larger screen - correct. Also is GeForce MX150 spending more than I need to? Is 940MX or HD620 OK - won’t HP2711X external monitor boost graphics regardless. For reference I’m looking at Dell Inspiron Laptops like I7773-7701GRY-PUS for a new computer.
You get a 6GB 1060 graphics card that will have your gaming covered for the next 3 - 4 years. It's a quad-core 7th gen i7 and you'll have to save up for an SSD to install later on, but I'd still say it's a much better deal than the Dell above.