I have a reference Radeon HD 7950 boost I would be willing to loan you, if you're interested. It will probably need to be flashed back to an appropriate firmware though as the last time I ran it was something of a firmware mod testbed.
...rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual. -- Thomas Jefferson