Common Access Card (CAC) Installation Support for Home Users more help can be found. I am also hearing it is affecting both Mac and Windows computers.
![]() Card capacity and size
Mac Pro has eight PCIe x16* sized slots that accept many different types of PCIe cards:
Mac Pro Expansion (MPX) Modules can use up to two slots each — in slots 1-2 and slots 3-4. Mac Pro comes with the Apple I/O card preinstalled in slot 8 which contains two Thunderbolt 3 ports, two USB-A ports, and a 3.5 mm headphone jack. Learn about PCIe cards you can install in your Mac Pro (2019).
Check available slots
To check the status of each slot, choose Apple menu > About This Mac, then click the PCI Cards tab.
By default, Mac Pro automatically balances bandwidth between all of the cards across the two PCIe pools. You can use Expansion Slot Utility to make manual adjustments to pool allocations.
If you install two Radeon Pro Vega II MPX Modules, you can connect them together using Infinity Fabric Link. Learn how to connect two Radeon Pro Vega II MPX Modules.
Installing PCIe cards
Learn how to remove the housing or top cover of your Mac Pro and install a PCIe card.
Remove the housing or top cover
Follow the steps to remove the housing on Mac Pro (2019) or the top cover on Mac Pro (Rack, 2019).
Mac Pro (2019)
Mac Pro (Rack, 2019)
Install a PCIe card
Reinstall the housing or top cover
Follow the steps to reinstall the housing on Mac Pro (2019) or the top cover on Mac Pro (Rack, 2019).
Mac Pro (2019)
Mac Pro (Rack, 2019)
Turn on third-party drivers
Some third-party PCIe cards require a driver before they can be used in macOS. After you install a driver for a third-party PCIe card, restart your Mac Pro, then turn the driver on:
Use Expansion Slot Utility
When you install or remove PCIe cards on your Mac Pro, EFI detects the cards in each slot and allocates bandwidth between the two pools to maximize throughput. Expansion Slot Utility lets you view and change how your cards are allocated.
Use Automatic Bandwidth Configuration![]()
By default, your Mac Pro uses Automatic Bandwidth Configuration to automatically manage how the cards are allocated to each of the two pools.
Assign pool allocations manually
If you want to manually assign the pool allocations for your cards, turn off Automatic Bandwith Configuration and choose a pool for each card. For example, you might want to give a single card 100 percent allocation of pool A.
Whenever you make changes to pool allocation, Expansion Slot Utility prompts you to save your changes and restart your Mac before they take effect.
Get help installing PCIe cards
Learn what to do if you get a PCIe card misconfigured error or your Mac Pro won't turn on after installing a PCIe card.
Resolve PCIe card misconfigured errors
If your PCIe cards can be installed in different slots to provide better performance, you'll see a PCIe card misconfigured notification after your Mac Pro starts up:
Click Learn More, which opens the PCI Cards tab of About This Mac. Then, click Expansion Slot Utility to view recommendations on how you should reconfigure your cards.
If your Mac Pro doesn't start
If your Mac Pro doesn't start up and the status indicator light flashes amber twice after installing a PCIe card, the card might not be compatible with your Mac Pro or you might have too many 32-bit PCIe cards installed.
If you recently installed one or multiple PCIe cards, remove each card one at a time and try turning on your Mac Pro after each card removal.
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