Alienware 17 R4 QHD version should work. the G-sync version runs the 1070 only, not sure about the 1080 and 4K versions. you can follow the progress here https://www.tonymacx86.com/threads/alienware-17-r4-installation-issues.244008/
I just installed High Sierra this morning - I am a step ahead of you. I was able to enter my password and log in. prior to the web drivers, the screen was very blotchy. screen looks good now, but still haven't injected NVIDIA yet. just wanted to make sure the web drivers loaded. attaching the...
thanks RehabMan. updated current Sierra clover folder with AptioMemoryFix, removed EmuVariableUefi-64.efi and OsxAptioFix-64.efi, and all works well
updated my High Sierra installer, and had no issues reaching the installer and installing to new drive
definitely add EmuVariableUefi-64.efi - this was in your original clover folder, but looks like it is missing from your latest clover folder. then you should be able to set inject NVIDIA to YES, since you have installed the web drivers,
I am using almost the same laptop (different CPU). I was able to reach the installer with inject NVIDIA and INTEL set to NO (clover\graphics\inject). I removed nv_disable=1, and used nvda_drv=1 in its place (clover\boot). this was using RehabMan's config_HD615_620_630_640_650.plist, renamed to...
see if post #252 works for you.
I used a command in terminal similar to:
sudo chown -R username:group directory
group would be adm or users, and directory is the folder that contains the files you wish to change
are you using intelbacklight.kext, or acpibacklight.kext? guide is written for intelbacklight.kext, and patch to SSDT7. May want to check RehabMan's thread for backlight troubleshooting - possibly try acpibacklight.kext instead (if you didn't follow the guide!)...