Question Top PCIE slot noemt working bit lower one does.

FINNIE8OY

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Jun 7, 2017
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So i built my griend PC and everything went well. But after a week of gaming his pc screen was a constant black screen and his gpu fans worked only a few seconds after booting. So i tried Some things and when i put the gpu in his second PCIe slot (Wijchen is a 4x pcie slot(top PCIE slot is a 16x)) everything worked fine. But he really wants his max performance so does anybody know why the top slot doesnt work.
things i tried:
i have updated the bios
Replug ram and cables.

i Think it has to do wijt the motherboard, but i read That cpu controls pcie 16/8x slots and not 4x.
another note: his cpu temps with the stock cooler were pretty high( 90+ while using cpu burner)
pls help me

Specs: 16 gb ram
Rtx 2060 super gaming x
B450 elite
Ryzen 5 3600
Corsair cx650m