With every new OS release, Apple tightens its ecosystem to make the Mac work more closely with mobile hardware, and Mojave is no exception. My favorite new feature is Continuity Camera. Prep the macOS Mojave Installation. The macOS Recovery Environment now opens in the virtual machine. (This is the screen that every Mac displays when you hold down Cmd-R at startup.). Redline Monitor is a listening, mixing, and mastering tool that makes your headphones experience more natural: as if the sound came from a pair of external speakers. The Mac Silver Tower 4,1 and 5,1 remain one of the most powerful Macs ever made, depending on your processor. Even the eight core 2.26 GHz version is incredibly powerful and fast, outrunning any MacBook Pro and most iMacs, as will a hexacore 3.33 GHz or 3.46 GHz. Certainly they are more expandable, repairable and upgradeable than any other Mac built since, with SATA SSD and PCI cards.

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The Mac Silver Tower 4,1 and 5,1 remain one of the most powerful Macs ever made, depending on your processor. Even the eight core 2.26 GHz version is incredibly powerful and fast, outrunning any MacBook Pro and most iMacs, as will a hexacore 3.33 GHz or 3.46 GHz. Certainly they are more expandable, repairable and upgradeable than any other Mac built since, with SATA SSD and PCI cards and graphic card upgrades readily available and easily installed. For video editors, the Mac Pro Silver Tower is one of the best computers ever built.

In terms of cost for performance, no current Mac whether iMac or iMac Pro can touch the 4,1 and 5,1 Silver Towers. What's especially wonderful is that both of them will still run the latest Apple OS and software perfectly, with just a bit of preparation. I'll take you through the steps of a successful deployment of a 4,1 Silver Tower with High Sierra.

Start by Testing Your Hardware: Apple Hardware Test

The first thing you should do is test your hardware. This is easier said than done on older hardware. Apple has some lovely software called Apple Hardware Test a.k.a. as AHT. There's no joy in suffering through crashes which are hardware related, trying to debug your OS (software).

Normally you find AHT at this path /System/Library/CoreServices/.diagnostics

Unfortunately, recent versions of the OS have not included AHT or at least not for older computers. Happily some enterprising Apple fans have collected all the versions of AHT out there for all kinds of Apple computers including Powermac, Powerbook, iBook, iMac, MacMini, MacPro, MacBook and MacBooks Pro.

As we have mainly MacPros here from 4,1 generation, mostly upgraded to 5,1 firmware, we generally prefer the bundle which includes both 4,1 and 5,1 MacPros.

Installing AHT should be as easy as just as just copying the .diagnostics hidden folder over. Through OS X 10.10 that was all a user had to do to install a working AHT and then press D when restarting his or her Mac.

But since OS X 10.11 El Capitan, it's not that easy. To be able to install any files at all to the System folder, first you must disable System Integrity Protection. Apple and third party sites will try to scare you off of turning off SIP. Apple OS X users got by for fifteen years without SIP so it's not as big a deal as it sounds. Any malware clever enough to deploy on OS X will find a way to do so even with SIP turned on. SIP is just putting another lock on the door. Locks rarely stopped an expert burglar (he'll just go through a window).

Disabling SIP

Fortunately turning off SIP is easier than it looks. If you have a solid OS X 10.11, 10.12 or 10.13 installation you will have a recovery partition which can be accessed as simply as pressing command-R while rebooting before the grey boot screen comes up. This will take you to the recovery desktop which gives you access to a fully rooted Terminal app.

Inside Terminal, you can check SIP status by typing csrutil status. If you see System Integrity Protection status: enabled. just type csrutil disable. Terminal will print a message which says Reboot to disable System Integrity Protection. Isn't it great when command line commands say what they do and do what they say?

Graphic Card Limitations: Install a native Mac card for AHT and firmware updates

Since about 10.8.3, Apple OS X will allow you to install almost any AMD video card (i.e. Radeon 5770, 5870, 6850, 6870, 7850, 7870) and with Nvidia drivers you can use most modern Nvidia graphic cards (including the very popular GTX 7xx and 9xx series). These third party cards do not show the Mac boot screen however. You can probably turn SIP off without a boot screen card but you will not be able to use AHT without a native Mac graphic card. Make sure you have an Apple flashed AMD 5770 or 5870 or an Nvidia 120 handy before you proceed or you won't get far (there's a couple of firmware updates ahead). Even an old Apple Radeon 4870 will get the job done.

When you are finished the full install to High Sierra, you can put your high powered Windows graphic card back in your Mac Pro. With High Sierra, you have access to the AMD RX580 and RX Vega 56 with no system hacks on the red side.

For video editors: Nvidia's GTX 1070 and 1080 are equally available to you. For FCPX, AMD's RX580 is the much better choice. For Adobe CS and CC suites, Nvidia is slightly better. For Davinci Resolve 15 and up, both Nvidia (CUDA) and AMD (OpenCL engine) are good - the more powerful the card the better.

Making Hidden Files Visible to Finish the AHT Install

Now you should reboot normally with no modifier keys pressed. When you reach the desktop (probably after logging in), you should now either install a demo of Forklift (gives you a twin pane interface like the old Norton Commander on DOS and a GUI switch to hidden files) or make hidden files visible. This is an easy trip to the terminal. Type: defaults write com.apple.finder AppleShowAllFiles YES. After that you should press command-option-ESC and choose 'Finder'. You'll see a button to 'Restart'. When Finder restarts, hidden files will be visible.

Apparently in OS X Sierra (10.12) and later, Apple has exceptionally made life easier for power users by enabling this command: command-shift-. This does not work on El Capitan 10.11 (just tested).

At this point you can navigate down to the .diagnostics folder on your 022-5348-A.dmg disk image and copy it over to /System/Library/CoreServices/.diagnostics on your boot drive.

You are now ready to use Apple Hardware Test. Just restart one more time while holding down D on an Apple keyboard.

Keep in mind AHT does not work on Hackintoshes of any breed. AHT is just for testing Apple computers. In testing a half a dozen silver towers, I've found that sensor errors are most common. Depending on the sensor your silver tower will run just fine despite the invisible error.

On the other hand, video card sensor errors on the other hand will require you to run headless (quickly enable VNC and/or screen sharing in the 'Sharing' control panel while you have access to a shaky image. If you have no image, you could move that startup disk over to another mac and enable sharing on before rebooting with that startup disk on the troubled Mac. A headless silver tower makes a great remote file server to access from another Mac. If you have Gigabit ethernet (most wired routers these days are Gigabit capable), you'll be able to transfer files at up to 100 MB/sec which is faster than most spinning disks.

Installing the 5,1 Firmware Update

If you have a Mac Pro 5,1, you don't have to install a firmware update to be able to install High Sierra. To update a Mac 4,1 to High Sierra, you must upgrade its firmware to 5,1 to be able to install High Sierra.

Happily, you are halfway to the firmware upgrade though having already disabled SIP. Start by downloading the Mac Pro EFI Update directly from Apple and Hackintosh guru Netkas's Firmware Update Tool from his forum (first post).

Basically you make sure the disk image is mounted and then double click the Firmware Update Tool. After installing the firmware update, it's important to press the start button extra long when restarting until the power light starts blinking. You'll hear a long bong within 30 seconds and then you'll watch a grey screen where a firmware update installs along the bottom.

Which OS to Install: El Capitan, Sierra or High Sierra?

Now that you have a working and tested good silver tower, you could choose to install El Capitan, Sierra or High Sierra.

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