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Rolled back? Does it do it with a fresh install of those drivers per my instructions? Can you confirm both cards have the same drivers installed (see GPUz, and use the dropdown to see).
*1: The PCIe x16_3 slot shares bandwidth with PCIe x1_1 slot, PCIe x1_2 slot, USB3_34 and eSATA. The PCIe x16_3 default setting is in x1 mode.