Question GPU USAGE GRADUALLY DECREASES OVERTIME!!

[SpecterK1]

Hey, Folks!
I actually have never posted a thread in this forum or been bothered to create an account, but now i'm extremely desperate after many attempts back and forth... and none worked!
so let's get straight to the point:

I have a Dell Computer (AiO Model) from early 2013, the PC Specifications are mostly capable of running many games at +80FPS, so this topic is not concerning the PC Specs, but rather the Problems within the Specs.

Spoiler: PC Specs

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Spoiler: PC Specs

Spoiler: PC Specs

Specifications ----------------------------------------------------

GPU: AMD (ATI™ Technology actually) Radeon HD 7650A Series

iGPU: Intel HD 4000

CPU: Intel Core i7 3770S 3.10Ghz

RAM: 8GB DDR3

HDD: (S)ATA ST2000DM001 >>>>> 2TB Storage

OS: Windows 7 Ultimate (Drivers for my AMD aren't available for Windows 10 + a disaster happens between Intel and AMD Drivers due to Display conflict, sadly i cannot upgrade)

Spoiler: FPS Averages

-------------------------------------------------- FPS Benchmark ------------------------------------------------------

VALORANT: 720P, High + Medium Settings ≈ 90FPS (MSI Afterburner)

Counter-Strike Global Offensive: 720P, Lowest Settings ≈ 115FPS (MSI Afterburner)

GTA 5: 768P, Lowest Settings ≈ 80FPS (MSI Afterburner)

Spoiler: FPS Averages

and other 2016/2015 Titles can run on average FPS of 50 depending on the Game.

>>>>>> My main issue of All this is that The more I spend time playing a Game, the worse GPU Usage gets... and I have absolutely no clue why this problem persists, I tried different AMD/Intel Driver Software, normally the latest version for certain OS should work fine, but none of this could help. For instance:

GTA 5: Starts at 90FPS, Peaks to 100 Sometimes, After 25 Minutes of Gaming in the World, GPU Usage Drops to 75% and then gradually to 68%, which makes the game runs so poorly at 43FPS
CSGO: Starts at 120FPS, Peaks to 160 Sometimes, After 1h30m of Gaming in the Map, GPU Usages Drops to 75% and then gradually to 68%, which makes the game runs so poorly at 53FPS


and same thing keeps happening with other games but the lighter the game, the longer it takes to Dip into this Crap of GPU Usage

NOTE: one thing I noticed and that DOES NOT MAKE Any sense at all! when looking at the Ground/Sky the GPU Usage Cranks up to 100% and the FPS Goes so crazy beyond the Average but as soon as I go back to normal view it just returns to the bad GPU Usage


So that's all I can say, I really would be glad to hear some Suggestions or Fixes that can Patch this bloody problem, Thanks in advance

TL; DR?
GPU USAGE DIPS SO BAD AFTER A PERIOD OF CONSTANT PLAYING. ANY FIX OR HELP? (More info is provided above.)

 

[Gam3r01]

Have you monitored your temps while in game? It sounds similar to thermal throttling.
Takes time for the system to heat up, less demanding games would take longer, performance degrades as clock speeds are slowed down to keep temperature in check.

 

[SpecterK1]

Have you monitored your temps while in game? It sounds similar to thermal throttling.
Takes time for the system to heat up, less demanding games would take longer, performance degrades as clock speeds are slowed down to keep temperature in check.

Um, PC Case is closed and My G/C PU temps are averaging from around 46C° sometimes 51C° at Max
do you think it's a problem related to Power Supply?