RX 480 low FPS on GTA 5

[gwaphomet]

I just bought a Sapphire Nitro+ RX 480 4GB replacing my old GTX 970. Uninstalled nvidia driver via DDU and installed the latest AMD driver from website. For some reason, when running a benchmark on GTA 5 im only getting around 30-40fps, when on the 970 i was getting around 60s. Here's my spec

CPU: FX 8350
MOBO: 970A-DS3P
GPU: Sapphire Nitro RX 480 4GB OC
RAM: 8GB 1600
PSU: GXII Pro 650W

I've tried Rise of the tomb raider and test gets around 80s in average. when playing evolve im getting around 70s. have not played GTA 5 for a month or two, so I updated it today but it surprised me when im getting a low fps when running it's benchmark test. I've even set most of the settings to medium and still the same. i had no issue when i had my 970 before. Im not sure what to look at here in fixing this issue, help me

 

[sizzling]

Looking at this the 970 is stronger in GTA V http://www.anandtech.com/bench/product/1749?vs=1743

 

[gwaphomet]

thanks for replying man. I see how the 970 performs better in gta 5, but im wondering why would i get around 30 fps on the test i did with medium settings only and on 1080p resolution. Is it just the way it should be? I'd be glad to show my settings here, but not until i get home in 6hrs

 

[sizzling]

Best to wait if someone with a similar setup can comment