Installation of High Sierra 10.13 on unsupported Macs

"Here's a supposedley working method:

http://dosdude1.com/highsierra/

I however couldn't successfully replicate it :(... Yet ...!"

"Hello there.

So i have a Mac Pro 2009 (4,1). Some months ago I flashed the EFI to 5.1 for an upgrade.

I've installed 2 x 3,46 GHz 6-Core Intel Xeon, an NVIDIA GeForce GTX 1070 8191 MB and 32 GB 1333 MHz DDR3.

I've had the 2 x 2.26 4core and NVIDIA GTX 680.

Because of Final Cut Pro X 10.4.1 I needed high sierra. So I just did it. There was a problem with the graphics card (macOS graphic drivers where not recognizing the card and I had to use NVIDIA driver).

I did the firmware update but I didn't use the patch (the link above).

Just the High Sierra installer.

Everything is working well so far (I don't know about the wi-fi card cause I ain't got any).

The Model Identifier is still 5.1.

That was my experience so far. I'm running on macOS High Sierra version 10.13.4 (17E202)"

"I have been running High Sierra on my 3,1 2008 8-core Mac Pro since September 2018, using DosDude1's installation. Has been relatively problem-free, though sometimes feels slower than El Capitan. One fault that took me a while to fix was random logouts for no apparent reason, but I pinned it down to a conflict between my GPU's. I have an unflashed EVGA Nvidia GTX 760 which performs well, and gives me CUDA in Photoshop and After Effects, but when problems do arise it's handy to be able to see the EFI boot screen, which I can't do with the PC Nvidia card, so I left the old ATI Radeon 2600XT installed powering a small monitor. This never caused any problems in El Capitan, but seems to be the cause of the random logouts, as they haven't occurred since I removed it. I installed a later Atheros Wifi card shortly after buying the machine, as the machine came without Wifi, and there have been no problems with High Sierra and WiFi.

DosDudes Patch Updater allows AppStore system updates to run. I ran a security update in November without a hitch, but since running the last update earlier this month the system has been prone to very slow system boots and boot freezes, so I have made a USB installer using the latest download and patches and intend to re-install the system."

currently i have only 3.33 ghz quad core. Although i do have another of the same CPU. I just havent gutten this machine yet to see if it has a built in board for a second CPU. However, lets say i dont even bother with it. I have an Nvidia 970 GTX and 12 GB of ram (currently). Do you think this is sufficient on my Mac Pro with the 5,1 firmware?