um no, the wiki link is to PCI-E have a look, even shows the differnce between PCI and PCI_E slots.
you can use PCI_E risers in PCI_E slots that allow cards to be spaced for cooling etc. That mother board has 5 x PCI_E x16 slot and one PCI_E x1 slot there is no performance difference soon the 6th card will be added
hope this is a help
shows a modified 1x PCI_E riser running a gigabyte 6950. and yes it only needs that small contact to power and transfer data - we are mining not gaming, the gpu does almost all the work, bandwith isnt a concern and a most pepole down clock thier ram to reduce heat.
Hope thats a help