Lenovo ThinkStation P720 Dual Xeon

It was a struggle to get to this point. I kept trying and retrying, but nothing worked; I was constantly stuck on an error in the verbose output. I built it 100% from scratch, editing SSDTs in Visual Studio Code and using iasl to generate the .aml files. I even tried downgrading the BIOS.

The biggest challenge was CPU mapping; it took months to figure it out. Even looking at setups with X299, X99, and single-socket C621 chipsets, nothing worked. In fact, Dortania lists the C621 chipset as "not recommended." I tried using information from people who succeeded with the P520 (the single-CPU sibling model), but I couldn't apply those methods here. I eventually found a forum post about an SSDT that redefines the processor from "Device" to "Processor"—since some BIOS versions changed how processors are listed in the DSDT—and that allowed the machine to boot with both processors and all cores fully functional.

System: macOS Sequoia 15.7.7 (it worked on Tahoe, but I downgraded because I still need to replace the Nvidia graphics card; the Lexa-based 550 is too laggy for my needs).

Processors: 2 x Intel(R) Xeon(R) Silver 4114 CPU @ 2.20GHz

Graphics: Radeon 550 Low Profile 2GB (DELL OEM) Lexa with Fake ID (Temporary).

Graphics: NVIDIA Quadro P4000 (Disabled in Device Properties).

Storage: 240 GB SATA + 2 TB HDD.

RAM: 128 GB 2400 MHz DDR4 (Expandable to 768 GB).

Connectivity: Wireless and Bluetooth working via RP-Core (AirDrop and Continuity); using Fenvi T919 (BCM94360CD).

I experimented—just out of curiosity—with the OCLP NVIDIA Web Drivers patch (OpenGL only), and the system crashed completely. It would be nice to be able to use it, but I plan to replace it with an RX 6600 or better.