Ben64, we try to make our products compatible to many third party components as possible, but we cannot always guarantee compatibility. Unfortunately in this instance this would appear to be the case.
Have you tried another PCI device on your motherboard, like a video card, in order to check if you got the same behavior?
It does seem to be a common issue with some motherboards, but it does appear to be the motherboards issues rather than the card. it seems to suggest it will work as long as the PCI-e spec has been followed correctly