I currently have two separate AMD graphics cards installed in my PC. A HD 7870 and a r9 390. I only need one of them at the moment, but I will need the second one, once I get a second monitor. The problem is that I can't use the r9 390 because my pc always boots with the 7870 and deactivates the one I would like to use. They both show up in the amd control center, but as I said the 390 shows up as deactivated, while the 7870 is the primary one.

I also tried to change it in the BIOS, but I couldn't find any settings that would do this.

I could probably solve this by manually plugging out the card I don't use, but I would rather not do that.

Any other ideas?

  • What happens if you physically swap the cards inside the PC?
    – Mokubai
    Jan 18 '16 at 17:26

The primary video card is set to a slot. Sometimes in the BIOS you can change it, but the choices may not be obvious. Instead of displaying the name of the card it just has PCIEX_1, PXIEX_2, etc or something similiar to that.

If the adjustment isn't in the BIOS you have to physically swap the 2 cards.

Also you can run both video cards in your system at the same time on 1 monitor, and still connect a 2nd monitor anytime you want. In many cases it boost the performance, and in rare cases you get 90% of both cards. There should be a small cable to connect them on the back. This is called a crossfire configuration, or SLI in the nvidia world.

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