Dell Inspiron 5680/ ST# H2B71Q2 - GPU upgrade options ???

The cards that will work with your current power supply won't give you any real boost in performance. I checked your ST# and it looks like the power supply is a standard ATX unit, but I cannot tell for certain (Dell typically uses proprietary units on their models). Users on other forums claim it is a standard ATX PSU. Upgrading to a 650W would get you enough overhead for a 4060 and 750W would allow for a 4070 Super or 4070 Ti Super.

If you want to make full use of that monitor, you would want to pair it with a 4090, a 850 to 1000 watt psu and Ram and a processor that won't bottleneck it with appropriate case and cooler for the CPU. It's a very high end gaming monitor. If you're not looking to essentially build a new computer and spend that kind of money, I would look into a lower end monitor.

Hey, Laptop parts don't run as fast as their similarly named desktop parts. That being said, you do have a pretty high end laptop and it will run the monitor pretty well until you decide to build a desktop to replace it.