looks like Dell locked BIOS for high series graphics,Sandy Bridge CPU.....UEFI could be an issue.....
Let's start with easier troubleshooting steps:
- Have you checked the BIOS settings to make sure auto or discrete graphics is the default adapter?
- Did you plug the monitor cable into the 290X, or into the motherboard?
This response didn't address either of my points.looks like Dell locked BIOS for high series graphics,
and there is no latest BIOS update for XPS 8300 just stuck on version A06.