FPS Drop after Fresh Windows Installation

[Moeezj]

So recently I got upgraded from GTX 1060 to RX 6700 XT. The main issue is that now games stutter when I start playing them and after few seconds stutter is gone but minor stutters are still there after few minutes although 1060 had lower fps but didn't experience any of these stutters even on older games like gta vc and gta san. On FurMark test it doesn't show any stutters.

Things I tried:
-uninstall old nvidia and amd drivers through DDU
-changed pcie auto to gen3 in BIOS
-tried unplugging my second monitor
-disabled iGPU

 

Later i decided to fresh Install Windows 11 but no luck, still have some stutters and in addition to that now i can feel 5-10 fps drops from originally i was having before reinstalling windows with same graphics settings. Please help me in this its too frustrating.
 

[Skiiwee29]

What is your full system specs

[Moeezj]

My System Specs

 

Processor: Intel i5 10600

GPU: Sapphire Pulse 6700XT

Motherboard: Gigabyte B460M DS3H V2

Ram: Corsair Vengeance 16GB 3200mhz

System SSD: Gigabyte NVMe 256GB

Secondary SSD: transcend 1TB SATA

HDD: Seagate 3TB

Deepcool 650w Bronze

Windows 11 Pro