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It does but I do not need all the performance under OSX.

Changing the maximum frequency of the memory on the GPU. Default it is set to 1750, with the custom powertable it is now set to 1000.

Had the same crashes and it looks like it is related to the fact that having two monitors connected keeps the memory frequency of the GPU at maximum speed. I increased the airflow in the case and used a power table to lower the memory max frequency to 1000. No crashed since these changes.

Shouldn’t WEG take care of that automatically nowadays ?

Here you go. Clover used is 5119. Created the SSDT-UIAC.aml and USBPorts.kext with Hackintool which will probably not match your USB port layout. Also generated new serials for imac14,2

Using the D3H variant of that board with a 4770K using imac14,2 works for me.

Single monitor connected to the DVI port of the 660. Intel gpu is enabled in BIOS and OSX, injecting Lilu and WhateverGreen via Clover.

Unfortunately after a couple of days and multiple sleep/wake cycles the corruption was back. I have now switched to the NVidia Webdrivers and after 2 weeks still no issues. Regarding the native power stuff, the model number (17,2 ?) used by me has native power for AMD so I did have to change...

On 10.13.6 using native NVidia drivers with GTX 660 and no artefacts after following https://www.tonymacx86.com/threads/macos-native-discrete-gpu-power-management.247479/ Using Model iMac17,1