If you're running Windows Vista go to Control Panel > Power Options > and go to change plan settings under whichever plan is currently selected > Change advanced power settings > PCI Express > Link State Power Management.
Change the setting to off and see if that fixes it. If it doesn't then change it back to the way it was so you won't be wasting power :]
I have seen this happen before its just down to how its reporting the card a PCIE 2.0 card reported at X8 is the same as a PCIE 1.0/1.1 card reported at X16. Dont know exactly why it does it.
Check your bandwidth against the reviews and as long as thats about right you are fine.
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