What is the pcie problem of ASUS b85 plus-r2.0 motherboard?

1, your original understanding is wrong. The second graphics card slot of this motherboard is originally x4 bandwidth, so there is no such thing as "the second one should be x8 transmission" (please refer to official website's explanation).

2. The second graphics card slot of 2.B85 motherboard is the bandwidth provided by motherboard chipset, instead of the two x8 slots split by x 16 provided by CPU.

3. So the second graphics card slot of B85 motherboard is PCI-E2.0x4 (the CPU provides PCI-E 3.0? X 16), this is because there are too few PCI-E channels provided by B85 (only 8 channels in total), and the bandwidths of SATA, USB and PCI are all included in these 8 channels, and the bandwidth of the second graphics card slot can only be 4 at most.

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