I have the same card.
If you are already running 10.6.7 you can install Chimera and set graphics enabler to no in com.apple.Boot.plist
Your system should boot without issue
Be sure to use the HDMi out and a single monitor until you get it up and running. Then you can tweak it to run dual monitors after.
Here is what my com.appleBoot.plist looks like
it is located in /Extra/
Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Kernel</key>
<string>mach_kernel</string>
<key>Kernel Flags</key>
<string>-v</string>
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>AtiConfig</key>
<string>Duckweed</string>
<key>Timeout</key>
<string>1</string>
<key>Legacy Logo</key>
<string>Yes</string>
<key>EthernetBuiltIn</key>
<string>Yes</string>
</dict>
</plist>
I added
Code:
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>AtiConfig</key>
<string>Duckweed</string>
Which allows Chimera to load the correct framebuffer for the card so it is recognized correctly by the system.
You don't need to do that at first. You can use a plist that looks like this to get started booting with the card.
Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Kernel</key>
<string>mach_kernel</string>
<key>Kernel Flags</key>
<string>-v</string>
<key>GraphicsEnabler</key>
<string>No</string>
<key>Timeout</key>
<string>1</string>
<key>Legacy Logo</key>
<string>Yes</string>
<key>EthernetBuiltIn</key>
<string>Yes</string>
</dict>
</plist>
You also don't need the kernel flag "-v" but it is helpful to use the verbose boot to help troubleshoot.
Mine seems to work best running Display Port and HDMi but the DVi port that is on top also works.
Does that all make sense?
Ty