Taped PCI Express X16 Running Up To X1
This is how a PCIe graphics card with only 8 workable lanes looks.
Here is the same card with only 4 lanes.
Even though PCIe is not intended to run at x2, we tried it anyways - it works without problems.
In case of x2 PCIe, front and back side have to be taped differently - accuracy is important here.
Last but not least, x1 PCI Express. It is definitely too slow for a graphics card, but in order to get a complete picture we included those results as well.
