Trying to use nVidia Telas C2070 GPG cards in X8DTG-QF mainboard. The problem is that I was using older BIOS and gave the bandwidth upto 6200 MB/s, but slower speed I found in later versions (dropping to 5300 MB/s). Why?
This is not the bug. Instead, the New BIOS enables "PCI-e Native Support by OS" feature, meaning that OS will take control over all PCI-e settings. The parameter for not dropping performance is to use "pcie_aspm=off" to boot Linux. Then ASPM is fully disabled for GPU and PCIe bandwidth from device to host will not be dropped.
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