This Card is not so compatible, I had to spend a few hours to figure what to inject and where to inject, also using SMBIOS for that
Had to edit some Info.plists:
1- AppleGraphicsPowerManagement.kext
In Mac-FC02E91DDD3FA6A4 (iMac 13,2)
you can find " Vendor10deDevice0fe0 " (closest to 650TI I could find) to copy and rename as Vendor10deDevice11c6
2- NVDAGK100Hal.kext
Added after IOProbeScore
<key>IOPCIPrimaryMatch</key>
<string>
0x11c610de£amp;0xffe0ffff
</string>
3- NVDAResman.kext
Added after IOClass
<key>IOPCIPrimaryMatch</key>
<string>
0x11c610de£amp;0xffe0ffff
</string>
4- RollBack on AppleACPIPlatform.kext from 10.8.1 ( found on multi beast )
5- Use " Chameleon Wizard.app " to set SMBIOS to iMac 13,2 (could be any other, you just have to copy info on Mac-FC02E91DDD3FA6A4 to any other areas to match, that is important or system will halt, it verifies with SMBIOS.
GE=No on boot, just that
System is running smooth, OpenCL working