You might want to take a look at this web site/page that has a lot of information about graphics cards and mac pro systems.



  • Apple Footer. Trade‑in value based on 2019 15-inch MacBook Pro. Trade‑in values will vary based on the condition, year, and configuration of your trade‑in device. You must be at least 18 years old to be eligible to trade in for credit or for an Apple Store Gift Card.
  • In this review of the graphics options for your classic Mac Pro, explaining the reasons why the RX 580 is the best card to get as well as showing you how to.

Supported Systems Name Description Revision Number File Size Release Date Download Link Mac Pro (2019) with Radeon Pro 580x, Radeon Pro Vega II and Radeon Pro W5700X / W5500X MacBook Pro (Retina, 16-inch, 2019) with Radeon Pro 5300M and 5500M MacBook Pro (Retina, 15-inch, 2015-Present) iMac (Retina 4K, 21.5-inch, 2017-Present) iMac (Retina 5K, 27-inch, 2014-2019).

Don't forget that your Mac Pro 2,1 system is 32-bit EFI (as well as the original 2006 Mac Pro - but all other newer Mac Pro systems from 2008 and on are 64-bit EFI systems) and that will limit your choices of graphics cards. A really good source of technical details about your Mac Pro 2,1 systems is at http://www.everymac.com/systems/apple/mac_pro/specs/mac-pro-eight-core-3.0-specs .html and for other Mac Pro systems see their web page at http://www.everymac.com/systems/apple/mac_pro/index-macpro.html

Mac


Gpu

Another good explanation about possible upgrades to older Mac Pro systems like yours is at http://lowendmac.com/2014/modernizing-the-mac-pro-11-and-21/

For

Gpu Upgrade Mac Pro 2013


Good luck..

Graphics Card Upgrade For Mac Pro 2012

  1. $349 Please contact us

    Features:
    • 5K Support.
    • No special hacks required. Works with macOS 10.13 High Sierra and 10.14 Mojave.
    • Significantly accelerate any 3D/graphic applications such as Final Cut Pro X, Adobe CS6/Premiere/After Effects, or DaVinci Resolve.
    • Connectors: 1x Dual-Link DVI Port, 2x DisplayPort & 2x HDMI Port.
    • Up to five simultaneous screens.
    • 5120x3200 maximum digital resolution via DisplayPort @ 60Hz.

    Requirements:
    • Apple Mac Pro 2009–2012 (Mac Pro 4,1 5,1)
    • OS X 10.13.0 and later or Windows 7/8/10 via Bootcamp.
    • Requires your Mac Pro's internal 6-pin PCI-Express power connector (the cable is included).

    KIT Includes:
    • AMD Radeon RX 580 8 GB.
    • Item conditions: new. 1 year warranty.
    • 1 x PCI-E power cable for Apple Mac Pro.
    • Installation instructions via email.
  2. $699 Please contact us
    Features:
    • 5K Support.
    • No special hacks required. Simply plug it in and install the latest NVIDIA Graphic/CUDA drivers. Full PCI-E bandwidth.
    • 2560 CUDA cores significantly accelerate any 3D/graphic applications such as Adobe CS6/Premiere/After Effects or DaVinci Resolve.
    • Connectors: 2x DisplayPort, 1 x DVI, 1x HDMI Port.
    • Up to four simultaneous screens.
    • 5120x3200 maximum digital resolution via DisplayPort @ 60Hz.
    • No boot screen support.
    Requirements:
    • Apple Mac Pro 2008–2012 (Mac Pro 3,1 4,1 5,1)
    • macOS 10.12.4 - 10.13.6 or Windows 8/10 via Bootcamp
    • Requires both of your Mac Pro's internal 6-pin PCI-Express power connectors (cables are included).
    KIT Includes:
    • NVIDIA GTX 1080 8 GB.
    • Item conditions: used.
    • Fully tested and 100% working. 60 days warranty.
    • 2 x PCI-E power cables for Apple Mac Pro.
    • Installation instructions and drivers via email.
  3. $899 Please contact us
    Features:
    • 5K Support.
    • No special hacks required. Simply plug it in and install the latest NVIDIA Graphic/CUDA drivers. Full PCI-E bandwidth.
    • 3584 CUDA cores significantly accelerate any 3D/graphic applications such as Adobe CS6/Premiere/After Effects or DaVinci Resolve.
    • Connectors: 3x DisplayPort & 1x HDMI Port.
    • Up to four simultaneous screens.
    • 5120x3200 maximum digital resolution via DisplayPort @ 60Hz.
    • Full boot screen support.
    Requirements:
    • Apple Mac Pro 2009–2012 (Mac Pro 4,1 5,1)
    • macOS 10.12.4 - 10.13.6 or Windows 8/10 via Bootcamp.
    • Requires one of your Mac Pro's internal 6-pin PCI-Express power connectors (cables are included) + additional power from 2 HDDs or one ODD drive.
    KIT Includes:
    • Flashed NVIDIA GTX 1080 Ti 11 GB.
    • Item conditions: used.
    • Fully tested and 100% working. 60 days warranty.
    • Cards may have a different fan/branding, but the performance will be the same.
    • Power cables.
    • Installation instructions and drivers via email.
  4. $599 Please contact us

    Features:
    • 5K Support.
    • No special hacks required. Simply plug it in and install the latest NVIDIA Graphic/CUDA drivers. Full PCI-E bandwidth.
    • 2816 CUDA cores significantly accelerate any 3D/graphic applications such as Adobe CS6/Premiere/After Effects or DaVinci Resolve.
    • Connectors: 1x Dual-Link DVI Port, 3x DisplayPort & 1x HDMI Port.
    • Up to four simultaneous screens.
    • 5120x3200 maximum digital resolution via DisplayPort @ 60Hz.
    • Full boot screen support.
    Requirements:
    • Apple Mac Pro 2008–2012 (Mac Pro 3,1 4,1 5,1)
    • macOS 10.10.5 - 10.13.6 or Windows 8/10 via Bootcamp.
    • Requires both of your Mac Pro's internal 6-pin PCI-Express power connectors (cables are included).
    KIT Includes:
    • Flashed NVIDIA GTX 980 Ti 6 GB.
    • Item conditions: used. Fully tested and 100% working. 30 days warranty.
    • 2 x PCI-E power cables for Apple Mac Pro.
    • Installation instructions and drivers via email.
  5. Features:
    • 5K Support.
    • No special hacks required. Simply plug it in and install the latest NVIDIA Graphic/CUDA drivers. Full PCI-E bandwidth.
    • 2048 CUDA cores significantly accelerate any 3D/graphic applications such as Adobe CS6/Premiere/After Effects or DaVinci Resolve.
    • Connectors: 2x DVI Port, 2x DisplayPort.
    • Up to four simultaneous screens.
    • 4096x2160 maximum digital resolution via DisplayPort @ 60Hz.
    • Full boot screen support.
  6. $549$449 Please contact us

    Features:
    • 5K Support.
    • No special hacks required. Simply plug it in and install the latest NVIDIA Graphic/CUDA drivers. Full PCI-E bandwidth.
    • 2048 CUDA cores significantly accelerate any 3D/graphic applications such as Adobe CS6/Premiere/After Effects or DaVinci Resolve.
    • Connectors: 1x Dual-Link DVI Port, 3x DisplayPort & 1x HDMI Port.
    • Up to four simultaneous screens.
    • 5120x3200 maximum digital resolution via DisplayPort @ 60Hz.
    • Full boot screen support.
    Requirements:
    • Apple Mac Pro 2008–2012 (Mac Pro 3,1 4,1 5,1)
    • macOS 10.10.5 - 10.13.6 or Windows 8/10 via Bootcamp.
    • Requires both of your Mac Pro's internal 6-pin PCI-Express power connectors (cables are included).
    KIT Includes:
    • Flashed NVIDIA GTX 980 4 GB.
    • Item conditions: used. Fully tested and 100% working. 14 days warranty.
    • 2 x PCI-E power cables for Apple Mac Pro.
    • Installation instructions and drivers via email.
  7. DISPLAYPORT CABLE ADAPTER converts the DisplayPort port on a computer to a Mini DisplayPort; Connect a PC with DisplayPort output to a monitor with Mini DisplayPort; A Mini DisplayPort cable (sold separately) is required
    EXPERIENCE 4K Ultra HD when paired with a 4K compatible computer, output display, and Mini DisplayPort cable; Supports video resolutions up to 3840 x 2160 and flawless audio pass-thru for uncompressed digital 7.1, 5.1, or 2 channels
    BI-DIRECTIONAL ADAPTER also connects a computer with Mini DisplayPort to a monitor with DisplayPort input; A Mini DisplayPort cable (sold separately) is required; Flexible adapter with gold-plated connectors and molded strain relief provides reliable signal transmission
    DISPLAYPORT COMPATIBLE with popular monitors such as the Dell U2410 and Samsung U28D590;
    Locking DisplayPort connector provides a secure connection with a latch that must be depressed before unplugging