XFX R7800 Series issue

I've replaced my graphics card (nVidia GT 740) with a new one (XFX R7800 Series Ghost Thermal Technology)
and I can't install the drivers for it.
I ran DDU, replaced the GPU, plugged in the 6 bit connector, but I can't install the drivers for it.
I downloaded the AMD Radeon HD 7800 drivers (I think these are the correct ones?), but when I try to install, it says that no supported AMD hardware is found.
When I check dxdiag or GPU-Z, it doesn't show the gpu I put in, but rather some Intel stuff. (I have an Intel Pentium G3258 processor.)
Can I have done something wrong, and is there anything I can do to fix it?

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Clarification Request
Vertical lines on monitors

Im using the XFX R7800 series (ghost). After I game for about 30 minutes, both of my monitor screens turn into colored vertical lines. But its not consistent, sometimes it'll do that after about 3 matches of league of legends. Ive done research and I cant find a solid answer. Ive tried to see if its a RAM problem, or memory issue, but I dont think it is. Im guessing it could be my VGA cables? I cant pin point it. I dont think its a temperature issue either. Where should both of my VGA cables be plugged in? They're plugged in directly from the graphics card, to the monitors. Other than that, everything else runes fine.

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When I see that

The usual things I find are:
1. The motherboard BIOS is out of date.
2. The motherboard drivers are out of date.

Check and correct those first.

There are a few boards the don't like AMD or Nvidia cards. Fix? Use the other make.

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