There use to - and still may be an issue - but I think it was in Snow Leopard - using two GT120s
Compatible GeForce 200 Series: - GeForce GTX 285. Compatible GeForce 100 Series: - GeForce GT 120. Compatible GeForce 8 Series: - GeForce 8800 GT. Compatible Quadro Series: - Quadro K5000 for Mac, Quadro 4000 for Mac. Compatible Quadro FX Series: - Quadro FX 4800, Quadro FX 5600. Apple Mac Pro NVIDIA GeForce GT 120 Apple Desktops & All-In-One Computers Apple MacBook Pro 16GB NVIDIA GeForce GT 650M Laptops NVIDIA GeForce GT 710 NVIDIA. The NVIDIA GeForce GT 120 with 512 MB of GDDR3 memory delivers excellent all-around performance whether your playing games or dealing with creative and scientific applications. With up to four NVIDIA GeForce GT 120 graphics cards installed, a Mac Pro can support up to eight displays simultaneously. Connect both the 24-inch Apple LED Cinema.
Snow Leopard is not supported with security updates and patches or updates like to Safari, only Mountain Lion and above.
PC cards and video out ports are always tricky as to which ports will work, and sometimes flashing can alter that.
One ATI 5770 supports 3 displays. You could use GT120 and something else. Had to posted here? read threads, looked for ideas ahead of buying.
PC cards will not have any video out until the drivers are loaded after login so you can't see what is happening, but the OEM GT120 monitor can.
Oct 22, 2014 10:31 AM
Nvidia Geforce Gt 630 Graphics Card
This article applies only to video cards that originally shipped with a specified Mac Pro or were offered as an upgrade kit by Apple. Similar cards that were not provided by Apple may have compatibility issues and you should work with the vendor of that card to confirm compatibility.
Mac Pro (2019)
Learn more about cards you can install in Mac Pro (2019) and how to install PCIe cards in your Mac Pro (2019).
Mac Pro (Late 2013)
- Dual AMD FirePro D300
- Dual AMD FirePro D500
- Dual AMD FirePro D700
Mac Pro (Mid 2010) and Mac Pro (Mid 2012)
- ATI Radeon HD 5770
- ATI Radeon HD 5870
Learn about graphics cards supported in macOS 10.14 Mojave on Mac Pro (2010) and Mac Pro (Mid 2012).
Mac Pro (Early 2009)
- NVIDIA GeForce GT 120
- ATI Radeon HD 4870
- ATI Radeon HD 5870, offered as an upgrade kit
The Radeon HD 5870 card requires Mac OS X 10.6.4 or later and the use of both auxiliary power connections.
Mac Pro (Early 2008)
- ATI Radeon HD 2600 XT
- NVIDIA GeForce 8800 GT (part number 630-9191 or 630-9897)*
- NVIDIA Quadro FX 5600
- ATI Radeon HD 4870, offered as an upgrade kit
The Radeon HD 4870 card requires Mac OS X 10.5.7 or later.
Mac Pro (Original)
- NVIDIA GeForce 7300 GT
- ATI Radeon X1900 XT
- NVIDIA Quadro FX 4500 (part number 630-7532 or 630-7895)*
- NVIDIA GeForce 8800 GT (part number 630-9492), offered as an upgrade kit.*
The NVIDIA GeForce 8800 GT card requires Mac OS X 10.5.2 or later with the Leopard Graphics Update 1.0 or the computer may not start up properly.
Mac Compatible Graphics Card
* To identify a graphics card part number, check the label on the back of the card.