Upgraded BIOS, PSU and GPU; computer running worse than before

[GoldenBrown]

Hi, yesterday I upgraded my setup with a new PSU, GPU and a BIOS update(all at the same time unfortunately, so I don't know what part of the upgrade is causing it) and my computer actually got worse. While on my old build I was able to play games like overwatch decently on medium settings, now I get 5-30 FPS on low settings and I also noticed a huge increase in loading times. Have you guys got any idea what might be causing it?

CPU: i5 2500k @ 3.3GHz
GPU: r9 390 8 GB
RAM: 8 GB DDR3 @ 665 MHz
Motherboard: H61M-E33
PSU: Corsair RM750x

 

[Icaraeus]

I would try refreshing the OS, and installing the latest stable drivers for your video card.

 

[GoldenBrown]

I would try refreshing the OS, and installing the latest stable drivers for your video card.

Refreshing the OS as in reinstalling windows? And I already downloaded the latest GPU drivers.

 

[Dunlop0078]

I would guess its some kind of driver issue with the gpu. What gpu did you have before? Was it AMD as well?

 

[GoldenBrown]

I would guess its some kind of driver issue with the gpu. What gpu did you have before? Was it AMD as well?

Yes, it was a HD 6950.