Sapphire 6990 Graphics card with waterblock, Sell or swap *

I have bought a new case with 2 huge rads and my 6990 is too big, so I am looking to downsize to 2 x 580s or something similar. The card is fitted with an alphacool waterblock and is in top condition. It was purchased in June 2011, but as the waterblock has been fitted, the warranty will be void, but the card has no issues and runs perfectly. Under load, it never has been over 50c! I will sell her for £320. I still have the air cooler but not sure where all the screws are, besides, they are too loud under load on air. Thanks