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Why do my RX-5xx cards run in PCIe 1.1 mode on my AMD platform motherboard?

Question asked by clutch on Nov 24, 2019
Latest reply on Nov 25, 2019 by clutch

This is the system:

Sapphire PULSE RX 590 8GB or XFX RX 570 RS 8GB (1st x16 slot on the board)

Asrock 970A-G/3.1
FX-8350 @ 4.6GHz
2x8GB DDR3 1866 RAM
PCIe x4 M.2 SSD (in M.2 header)
Rosewill H.I.V.E. 750W PSU
No other board slots are being used.
All temps are normal.

I Tried both my RX 590 and RX 570 (individually), and they both remain at PCIe 1.1 while running Furmark and GPU-Z Render Test.* Yet, two of my Nvidia cards (GTX 970 & GTX 1050 Ti) switch to PCIe 2.0. The Asrock AMD platform apparently doesn't like AMD cards!?

 

* only showed RX 570 results for an example, but the RX 590 was identical.

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