Thanks for the explanation. Reading it without the pic the first time was a bit confusing
To sum it up, whether I use the first or second PCIe x16 slot, adding anything to the free slot will reduce the speed.
Is the first or dark blue slot immune to this effect? Can I put a PCIe x1 card in the second PCIe x16 (grey) without degrading the speed of the primary PCIe x16 slot (dark blue)?