Do PCI USB risers lower the hashing rate?

I have a PCI USB riser like this one: I have 2 identical video cards with one plugged directly into the motherboard and one plugged in via the PCI riser. I am seeing a hash rate of 290 KH/s on the one directly connected to the motherboard and 210 KH/s on the one connected via the riser. The (…)

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