I had an AMD CPU that wouldn't work on PCIe 4.0, the CPU itself was defective and had to be RMA'd. In that case it just wouldn't do anything on PCIe 4, video card black screen (though it did seem to boot, but I never got far enough with it to be able to tell if the disk was slow).
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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