ASUS P5 Premium PCI-E slots x16?

I am currently running a 9800GTX+ on the blue PCI-E slot on my Asus P5Q premium motherboard. I recently found out that it's running at x8 and not the full x16 despite being the only video card in the machine. Looking at the manual is kind of confusing.

I do have a RAID card running in the third PCI-E slot (the second one is covered by the 9800GTX) - but is this the reason it's running at x8?

Where should I put this RAID card for max bandwidth and allowing my video card to run at x16?
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