Suggest appropriate GPU for my old AMD build!

[techoverclock0]

Hello,
I have been planning from several days to buy a new GPU to run my games like PUBG and CSGo and Far Cry 5 with decent fps and settings. I have pretty old PC that I build 4 years ago for gaming on a tight budget. Specs are:
CPU: AMD A8 6600k APU with Radeon 8570HD graphics
Motherboard: Gigabyte G1-sniper A88x gaming motherboard
GPU: Onboard GPU on APU, with shared 2 GB memory from main RAM
RAM: Corsair Vengeance 8GB (2x4GB) Dual channel memory. (2 GB shared to graphics)
PSU: Seasonic M12-II 620W 80+ Bronze Fully Modular power supply
Storage: WD Green 240GB SSD + WD Green 1TB HDD
Monitor: LG 25' ultrawide monitor 2560x1080, 21:9 ratio

I build this PC having one thing in mind that I will upgrade it sooner, but I didn't do it. But now I am feeling like I need a GPU to run my games. I want to run it on ultrawide monitor with ultrawide resolution. I know this badass CPU will bottleneck the GPU, so which GPU will be good for this. I have overclocked my CPU to 4.5GHz and RAM to 2133MHz with a stable overclock. This may help a little to reduce the bottleneck. I was thinking of
Nvidia GTX 1060 3/6GB
AMD Radeon RX580 4GB
Which one will be good and will give more performance in my build. I am also planning to record my gameplay. So kindly suggest me what to do. I have a tight budget and can only afford that much cost GPUs.
Any help is really appreciated.
Thank you
Regards

 

[Hellfire13]

That APU is pretty old by now for the modern cards. It is somewhere in the ballpark of the fx8300 performance... http://cpu.userbenchmark.com/Compare/AMD-FX-8300-vs-AMD-A8-6600K-APU/m7163vsm3344
But even the 8300 will start struggling if you go any higher than a 1050ti... https://docs.google.com/spreadsheets/d/1OCSzTslVki32BDSlEneeH3zJrTgD5iHe6IsWgbceHcQ/edit#gid=0

So, you should be getting a 1050/1050ti for max bang for buck.