After I moved one (Sapphire) of my 2 cards from "normal" pcie x16 slot to riser I get 15 H/s less on average on that card.

Also I switched my monitor from Sapphire to MSI.

Second card (MSI) which was always on riser stayed the same.

I have those blue usb 3 risers, could this be an riser issue? Or something else?

(v12.1, 15.12, oc settings same as before)