I replaced the RX570 4gb in my system with a used GTX 1660 Super, removed old AMD drivers using DDU safe mode, swapped the GPU and installed latest Geforce drivers. When I booted some games instantly noticed FPS drop shown in overlay: CSGO used to run close to 200fps, now it runs around 120; The Division 2 used to reach around 60fps, now it drops below that in congested areas, Hitman 3 also fps decrease around 20%. I noticed the GPU would be at 98-100% and CPU 60% or less (normal percentages as previous RX570), but GPU power for the 1660 Super never reaches the stated max of 125w, usually hovers around 80-110w. Also the GPU fan speed would sometimes spike from 0rpm to few hundred and back to 0 again during idle state. I'm sure I did a clean driver install with DDU, and CPU is not a bottleneck for this card, so how can it perform worse than an RX570? BIOS is already the latest version and I dont want to resort to something like windows reinstall. Also when running games, GPU-Z shows bus speed only at PCI-E x1 3.0 (not sure if this is GPUZ error) , Is it possible I got a faulty GPU or bad driver settings?
CPU: Intel I7-6700
Motherboard: Gigabyte H110M-H
Ram: Corsair LPX 16GB DDR4
SSD/HDD: Crucial MX 250GB
GPU: Gigabyte GTX 1660 Super
PSU: Antec Neo Eco II 650W
OS: Windows 10 21H2
Monitor: BenQ GL2460
CPU: Intel I7-6700
Motherboard: Gigabyte H110M-H
Ram: Corsair LPX 16GB DDR4
SSD/HDD: Crucial MX 250GB
GPU: Gigabyte GTX 1660 Super
PSU: Antec Neo Eco II 650W
OS: Windows 10 21H2
Monitor: BenQ GL2460
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