Why do my GPU work in the x4 slot. but not in the x16

Why do my GPU work in the x4 slot. but not in the x16

我刚刚完成了我的 PC 组装:i3-6100 CPU msi b150 游戏主板 XFX Radeon RX480 8Gb Corsair CX 450M PSU

So I installed the GPU on the first slot, the x16. It didn't work. I get no picture, but when I plug my cable in the integrated graphics, there is picture. The GPU lights up and the fans start spinning, so it's getting power. Then I tried putting it in the other slot, the x4 one. It works normaly, it gets detected and I can use it that way.

Why is that happening?

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