Have an XPS 8300 that came stock with a AMD HD 6670. It broke so I bought a Radeon R7 370 and a 600W power supply. As it is power goes to GPU (green light comes on) but it doesn't load any video. I remove the power and the Intel HD works. Am I still missing some power, or is there something else I'm missing ?
The 2010 XPS 8300 has the Legacy bios. Is there a switch on the R7 370 video card to move from UEFI bios to Legacy bios? If not, you will need to search for a video card that has the switch. Read this.
The best OEM AMD video cards we validated in the 2010 XPS 8300 are as follows =