Gigabyte x99 ud4p pci-e slots problem

Hello everybody, im having a problem with a new pc that finished building two days ago. To start with im going to give you my pc specs:
CPU: I7 5820k
Mobo: Gigabyte x99 UD4P
Ram: 16gb Corsair Vengance LPX 3000mhz
GPU: Nvidia GTX 560 (I know its old, a GTX 970 is coming)
PSU: Cougar GX 800 plus gold

What happened was that when i was building the pc i saw that its imposisble for the gpu to fit in the PCI-E slot 1 (the recomended to use with one GPU) because of the sink that its too big and contanct whit the card.
I've read the manual and I saw that PCI-E slot 1 and 2 can run at x16, so I decided to connect the gpu in slot 2.
The problem appeared when i started playing yesterday, I noticed that the velocity of the gpu was lower than it used to be and i proved that when i downloaded GPU-Z (pic below). It says that the card is running at x8, do i have to configure something on the bios or another program? or do i have to connect the gpu in slot 1 to run it at x16?

I'll be waiting for answers :D
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  1. Best answer
    It says that the card is running at x8
    Because your CPU, i7 5820K, has 28 lanes so that the 2nd pcie slot will run at x8 speed only. If you have other i7 like 5930K ( 40 lanes), then the 2nd pcie will run at x16.
    I7 5820K
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