My guess is some reviews are using boards which sadly have the PCI-E Gen 2.0 compliance bug where nVidia cards fall back to PCI-E 1.1.
The only boards I know off the top of my head which do not have this issue are the Intel own brand boards (DX38BT, DX48BT2, DX58SO) none of those have this bug.
Gigabyte P45 and P55 do not have this bug, but practically all ASUS boards do, Biostar's X58 suffers from this bug.
IMHO all board vendors need to get this sorted out with a BIOS update ASAP, the crippling of the GT200 and newer cards using PCI-E 1.1 really does show when you are playing games which use a lot of textures and/or playing at high resolution.
I just thought I'd mention this as the review results do seem erratic in places and as you can see, this here does not look right.
John





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