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The Mac Pro introduced in 2019 has eight PCIe slots:

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Installing Mac OS X Server on a Hardware RAID Volume Because configuring the Hardware RAID PCI Card erases the operating system on the server’s startup drive, you must reinstall Mac OS X Server after you configure the card. Here’s an overview of the procedure for reinstalling Mac OS X Server on a volume created with the hardware RAID card.

1. Holding down the alt (option) key Run the installer from the flash drive Open the terminal remove the current raid and create the new one (the diskutil and gpt commands).
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• Four double-wide slots
• Three single-wide slots
• One half-length slot preconfigured with the Apple I/O card

Mac Pro includes one or two Radeon Pro MPX Modules that occupy slots 1-2 and slots 3-4. You can choose your MPX Modules when you order your Mac Pro or order them separately from Apple. Learn how to install PCI cards in your Mac Pro (2019).

Apple AMD Radeon MPX Modules

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Apple currently has four different Mac Pro Expansion (MPX) Modules that contain AMD Radeon Pro graphics processing units (GPUs). Radeon Pro MPX Modules can use slots 1-2 and slots 3-4, and you can install one or two of each module:

• Radeon Pro 580X MPX Module: one module only
• Radeon Pro W5700X MPX Module: one or two modules
• Radeon Pro W5500X MPX Module: one or two modules
• Radeon Pro Vega II MPX Module: one or two modules
• Radeon Pro Vega II Duo MPX Module: one or two modules

You can use Radeon MPX Modules along with other third-party PCIe graphics cards. If you use Boot Camp, using a Radeon MPX Module and a third-party AMD graphics card isn't supported when your Mac is using Windows. Learn about using AMD graphics cards with Microsoft Windows on Mac Pro (2019).

Apple I/O card

Mac Pro comes with the Apple I/O card, which has two Thunderbolt 3 ports, two USB-A ports, and a 3.5mm headphone jack. The Apple I/O card comes preinstalled in slot 8 and can't be installed in another slot.

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Third-party PCIe cards

You can install many different PCIe cards in your Mac Pro, such as fibre channel cards, fibre networking cards, and pro video and audio interface cards. The PCIe bus on your Mac Pro provides up to 300W auxillary power. If your PCIe card requires additional power, such as a GPU, use the Belkin Aux Power Cable.

Mac Pro supports the same GPUs that are supported by external graphics processors (eGPUs). If you use Boot Camp and want to install a NVIDIA card to use in Windows on your Mac, don't install the card in slot 2. Learn about using AMD graphics cards with Microsoft Windows on Mac Pro (2019).

Some older PCI cards might use 32-bit Option ROMs that aren't compatible with your Mac Pro. If you install a PCI card that uses 32-bit option ROMs, your Mac Pro might not start up correctly.

Afterburner

Afterburner is a hardware accelerator card made by Apple. Learn more about Afterburner.

RAID cards

If you want to add additional storage, you can install a third-party RAID card, such as a SAS RAID card, or you can install the Promise Pegasus R4i 32TB RAID MPX Module in one of the two MPX bays. If you use Boot Camp on your Mac, Windows doesn't support Apple software RAID volumes.

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With the release of Mac OS X 10.11 (El Capitan), Disk Utility has changed so that it no longer creates RAID 0 or RAID 1 RAIDs. There are also issues with properly monitoring drive health. (Thanks to Larry O’Connor at OWC for bringing this to my attention.)

DEFINITION: A RAID is a collection of separate hard disks that are combined to act as a single drive, providing greater storage and faster speeds. RAIDs are configured into different levels: 0, 1, 10, 5, 6 and 50. (This article describes RAID levels in more detail.) RAIDs can be created using software or hardware. In all cases, a RAID requires at least two separate hard drives; the most popular systems use either 4 drives or eight, all built into a single enclosure.

THE SCOPE OF THE PROBLEM

This problem is significant, but very specific:

• If you created a RAID using Disk Utility in any version of the Mac OS prior to 10.11, it will still work in the new operating system.
• If you are using a hardware-based RAID, it will still work in El Capitan. (To be safe, check with the manufacturer of your RAID to see if any updates are needed.)
• If you are using a software-based RAID, it will still work in El Capitan, though you may need to upgrade the drivers. (To be safe, check with the manufacturer of your RAID to see if any updates are needed.)

What no longer works is the ability to use Disk Utility to create, or re-create, any RAIDs in Mac OS X 10.11 (El Capitan). This means that you will need to use other software to create a RAID.

Also, Disk Utility no longer monitors the health of your hard drives, nor does it allow you to repair permissions.

THE OLD DISK UTILITY

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In versions of the Mac OS prior to 10.11, when Disk Utility was started, a RAID option existed in the menu bar at the top.

This allowed us to create new RAIDs in one of three formats:

• RAID 0
• RAID 1
• JBOD

Additionally, the bottom of Disk Utility displayed the SMART status of a drive, which was designed to provide an early warning of drive failure.

These features no longer exist in the latest version of Disk Utility, shipped with El Capitan.

THE NEW DISK UTILITY

After upgrading to El Capitan, Disk Utility has an entirely different look. The entire RAID submenu is gone, as is the ability to check the SMART status of the drive.

NOTE: According to Larry O’Connor, SMART diagnosis was too far “after the fact,” to actually prevent data loss. Watch his interview, at the bottom, to learn more.

The ability to repair permissions is also gone.

And repairing a hard disk is simplified, as well; though twirling down Show Details does provide more information on the status of First Aid operations.

Another new thing I noticed when Disk Repair was running was that all other applications and window actions were paused.

WHAT DOES THIS MEAN?

If you have a hardware RAID, this is not an issue.

If you have a software RAID, or plan to create them in the future, you will need to use other software than Disk Utility to initialize the RAID.

A program that I use personally is SoftRAID – www.softraid.com – developed by SoftRAID. I’ve been using it on multiple systems to create RAIDs, monitor RAIDs and support RAIDs. It has never caused me a problem and I recommend it highly.

TO LEARN MORE

Watch this interview that I did last week with Larry O’Connor, CEO of OWC, discussing this problem in more detail, and outlining additional software options.

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Carpet Raid Mac OS