I have been having trouble with this graphics card for a while now but finally got it working!
I'm posting this as i've found no other resource on this particular card, and only managed to get it to work after finding the right kexts individually!
To make this card work, simply do the following:
Uninstall existing drivers.
Download the file attached, unzip and extract to the Extensions folder.
Then open up the terminal and chmod / chown all the files, ie:
There are 15 files so you will have to write out 30 commands in total.
sudo chmod -R 755 /System/Library/Extensions/ [filename]
sudo chown -R root:wheel /System/Library/Extensions/ [filename]
Restart, and the card should be working!
At the moment it's limited to 512MB, but changing it to 1024 should be a simple tweak. Since i've just got it to work after days of frustration, i don't feel like messing with it!