[SOLVED] GTX 960 2GB GPU running at PCIE x4 3.0 instead of x16 3.0

Aug 21, 2021
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The problem I am facing is that my Zotac Gtx 960 is plugged into x16 3.0 slot but when I check GPUz it say x16 3.0 @ x4 3.0 even at underload, (see attachment)

I have tried AMD firepro v3900 which is x16 2.0 card on same mobo which worked fine at x16 2.0 on the first try. ( see attachment)

I have cleaned my whole GPU including gold contacts as seen on some other thread, updated BIOS, Updated drivers, but nothing worked.
NEED HELP!

Specs:
Core i5-3570 @3.4GHz
Ram 4GBx2 DDR3
Asus P8H61-i LX R2.0/RM/SI ITX mobo
Zotac GTX 960 2gb
Antect vp450p 450 watts psu
Kingston 120 gb ssd
WD Blue 500 gb hdd