Question GPU usage goes down the more there is on the screen

May 6, 2019
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Hi, so basically my GPU usage goes down the more stuff there is on screen. It's like that on Fortnite and Watch Dogs, I want to know why. I feel like it's a driver problem. The CPU, RAM and VRAM does not go down, it's only the graphics card usage that drops, thanks!
 
Not sure about the manufacturer of the GPU, I think it's made by gigabyte, it's an r7 240 with 2 GBs of GDDR3 RAM and it was bought in 2014, along with all the other components
the CPU is an FX-8320 with the stock cooler
the RAM is 2x4 GBs of DDR3 RAM running in dual channel
the motherboard is an ASRock 990 Pro3.0
Seagate 1000GB HDD
the PSU is a CoolerMaster RS-600-ACAB-M2
there's also an optical drive, but I don't think it's important
the GPU is also overclocked to get the most performance out of it using MSI AfterBurner.