With that CPU..... Unfortunately it will bottleneck alot of cards, that and it only has 4GB of DDR3 ram since you're not on skylake. I would honestly build a new rig if you want to game on PC with STABLE HIGH END SETTINGS. That being said no one here can for sure tell you how your CPU would work with a new graphics card (RX 480/970/1070) since it's really old. It gets 30 FPS in less intensive parts on GTA V with a 750ti on Very High. So I would assume you could get medium-high settings with an RX 480 at 60fps or higher on most AAA games. You won't want to put in a higher range GPU because of the bottleneck. You are definitely going to want to get more RAM. So I would look at the 480x benchmarks and buy it if the price/performance is as good as projected (200 bucks for 980 perfromance is a steal).
Edit: If your Dell power supply is not upgradable you might not be able to put a decent GPU (or any Discrete GPU at all) in the PC since the people above me say it's different than most PSUs. If the case is too small the GPU might not even fit at all. NOW IS NOT THE TIME TO BUY A GPU. Wait for AMD and nVidia's new cards.
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