Hi all,
I get one of those Mac Pro (early 2009) flashed 5.1, 2 x 2.26 GHz Quad-Core Intel Xeon, 16 Go 1066 MHz DDR3, Nvidia GeForce GT120, 640 Go.
I just install a Nvidia GeForce GTX Titan X 12 Go (Maxwell) graphic card Founders Edition in the PCIe slot 1.
The Mac Pro run macOS High Sierra...