Question PCIe 3.0 GPU and Ryzen 3950x

Dec 9, 2019
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Hello,

I'm building new desktop computer case with Ryzen 9 3950x CPU. I'm computer programmer and i need CPU and Storage speed. Because of that i bought M2 PCIe 4.0 SSD. I don't need GPU power too much so i decided to buy Sapphire RX590 GPU card. But i'm confused a bit. This card is PCIe 3.0. But my CPU, Motherboard and M2 Cards are PCIe 4.0. If i use this card, my cpu will support RX590 with PCIe 3.0 version. Is it downgrade my M2 Cards speed to PCIe 3.0 too? Or they are completely different channels and my CPU control them separately?
 

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