PCI Express Maximum Payload Size
This value is under PnP/PCI Menu. By default it's set at 4096, but advice from DFI suggest to set it at size of video card memory. So 256MB 6800GT PCI-E, set it at 256 instead of 4096. Been corrected by a few folks, that its the packet size for data streams sent through the PCI-E bus. So try leaving it at 4096


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