Today after hacking around with my plists I’ve managed to get my GTX 285 1gb working.  Happy days and it feels much faster.

Update:

Due to people not having any luck, I’ve uploaded my boot files, put these in the extras folder and use the latest Chameleon version.

GTX285Kext

Following this, here is my boot.plist.

<?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>-x32</string>
<key>Timeout</key>
<string>1</string>
<key>device-properties</key>
<string>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</string>
<key>Default Partition</key>
<string>hd(1,2)</string>
<key>EthernetBuiltIn</key>
<string>y</string>
</dict>
</plist>

Hope this helps. The only thing I cannot get working is Quartz.