hi, and welcome at this board
you got this card. right?
the problem is, that the aquagratiX800 cooling block will only fit with agp-x800 graphiccards. the pci-express cards have another layout.
i think it's the best way to write an e-mail to support@aqua-computer.de. maybe they will take it back.
and please note: mails can take a few days before you get a reply. ac is very busy at the moment, due to comming X-mas.