pic-e cannot work in pci slots, they are completely different...
pci-e x16 v/s x1 is not compatible wrt gfx cards afaik...
IIRC you need to have x8 and above to run a gfx card and transfer the data, x1 doesn't have sufficient lanes to meet the performance requirements... also I am not sure about the power delivery, I am not sure if there is a difference between x1 and x8/16 wrt what power is delivered to the component in the slot...
have to spend some time reading up about all the new tech...