are mordern PCIe 3.0 cards always compatible to PCIe 1.0 mainboards?
(I am still happy with an nvidia 750 based Phenom 1 board and want to keep it until Zen. Now I need a graphics card für 4k displays.)
You would have to try it and see since the chipset and motherboard + BIOS also play a part it isn't just the PCIe slot.
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