
P.S: For anyone whom is going to use these information: With 10.13.2 and Webdriver 104 I have no lag, none what so ever! and I'm downloading the 10.13.3 Combo update right now and once it's done I'm gonna install the Webdriver 157 to see if it performs as smooth as 10.13.2 with 104 Webdriver. Great job for finding this and thanks for sharing it Otherwise the system will shutdown short after trying to boot into the macOS. I added the board-ID of the iMacPro1,1 which is: Mac-7BA5B2D9E42DDD94 under the "SupportedBoardIds" and I also added the iMacPro1,1 under the "SupportedModelProperties" The most important part as you mentioned is to add the following information to the "ist" which can be found in /System/Library/CoreServices: If you are looking for a guide on how to build an iMacPro you can read the following topic which will discuss the steps in depth and detail by the place to discuss the new options and benefits of using the iMacPro and can confirm that with iMacPro1,1 SMBIOS I was able to boot into macOS High Sierra 10.13.2 without the need of using nVidiaGraphicsFixUp.kext or NVWebDriverLibValFix.kext or adding the KextToPatch entry to change the board-id to prevent the "No Signal" issue on my 1070 GPU. This is not a guide on how to build an iMacPro.
