This is a 2012 Mac Pro 12 core 2.66Ghz with 16g of ram and a 27” Apple Cinema Display.
The computer has no hard drive( I pulled it ) you will need to load your own OS onto a drive and pop it in. The computer was having some flickering screen issues so we just replaced it rather than trying to fix the issue. It could be the GPU or the display itself. If you are looking at this Mac you probably know enough to fix all of the above.