Configure a 2019 iMac for Video Editing [u]

Posted on by Larry

[ Update: On March 19, 2019, Apple released updates to both 21.5″ and 27″ iMacs. These new systems feature improved CPU and GPU options, though the display and storage remain the same as earlier versions. I’ve reflected these new options in my recommendations below. ]

At their WWDC, in June, 2017, Apple announced and released new iMac computers, designed to meet the needs of professionals. These new systems sport a variety of very exciting features. However, if you are on a budget, how do you determine where to spend your money?

This article is designed to help you make more informed choices when you don’t have a lot of money to spend.

NOTE: I have not purchased any of these systems. My recommendations are based on past experience, current system specs and talking with informed individuals.

EXECUTIVE SUMMARY

If money is no object, buy the top of the line iMac. It will work great and you’ll have bragging rights over all the other systems.

But, if money IS an object, then you need to make trade-offs, balancing the performance you need with the money you have. However, you don’t need to spend a fortune to get a system today that can meet your editing needs for the next several years.

ALSO: Here are two other configuration articles you may find useful:

YES, BUT WHAT ABOUT THE IMAC PRO?

Holy smokes! What a system.

This review covers the iMac. Click here to read about the iMac Pro.

YES, BUT WHAT ABOUT THE MAC PRO?

Given the latest iMac releases, there are very, very few reasons to purchase a Mac Pro right now; especially given its price. Keep in mind, however, that Apple has already announced they are working on a new, top-of-the-line Mac Pro which will ship sometime in 2019.

Given what Apple has announced for the iMac Pro, however, that upcoming Mac Pro will need to be a true screamer to compete. I’m looking forward to seeing what Apple creates – but, as I mentioned earlier, I still need to pay my bills today.

And that leads us directly to the latest updates to the iMac.

WHAT SIZE SCREEN?

Both Final Cut Pro X and Premiere interfaces work best on larger screens. This is not to say they work poorly on smaller screens, but both of these display a LOT of elements on screen. More screen room is MUCH better.

I recommend a 27″ display. Plus, all the new 27″ iMacs now share the same 5K Retina Display.

NOTE: One of my iMacs is an older 5K iMac. I’ve discovered, that while seeing a 5K image is nice, the on-screen text is often very hard to read. So I’ve lowered the screen resolution using System Preferences to make the text larger. I prefer to easily read the text to seeing every pixel in my image.

However, if the purpose of the new system is video compression, you don’t need the bigger screen size. In which case, you can save money and improve performance with a 21″ system.

NOTE: Both H.264 and the up-coming H.265 video codecs are hardware-accelerated in all the new hardware. While this won’t help when transcoding into ProRes, hardware-acceleration will significantly speed compressing files for the web.

WHAT SPEED CPU?

UPDATE Intel’s latest 8th-gen and 9th-gen Core processors, including up to a 3.2GHz six-core 8th-gen Core i7 with Turbo Boost up to 4.6GHz for the 21.5-inch 4K iMac and up to a 3.6GHz eight-core 9th-gen Core i9 with Turbo Boost up to 5.0GHz for the 27-inch 5K iMac.

While CPU speed is important, it is not critical for video editing; remember, iMacs that were current as recently as last month, were easily able to edit almost all forms of SD, HD, and 4K media.

Any of the processors in any of the new iMacs will be fine for video or audio editing.

UPDATE: The choice in the 21.5″ iMac is between i5 and i7. The i7 is worth the money because of its support for multi-threading. The choice in the 27″ iMac is harder: between i5 and i9, because it’s a $500 differential. Unlike the i5, the i9 supports multithreading. If you are doing multicam, 4K or HDR editing, or lots of video compression, the i9 is worth the money.

HOW MUCH STORAGE?

I really like that Apple has put Fusion drives into all but two of their iMacs. I own two iMacs with Fusion drives and I remain very impressed with these systems. They are an excellent balance between the speed of an SSD with the storage capacity of spinning media.

Keep in mind that the SSD portion of a Fusion drive is only a part of the total storage. For example, the 1 TB Fusion uses a 32 GB SSD, while the 2 and 3 TB Fusion drives use a 128 GB SSD. The OS watches what you do and moves files onto the SSD based upon what you are using most. Which means that a Fusion drive works fastest with files you access over and over.

NOTE: Here is an updated article on storage speeds and media requirements that explains the load your storage system needs to carry.

If you want maximum performance AND you plan to store media on an external drive, get the 512 GB SSD. All the files in macOS will take less than 30 GB, leaving plenty of room for working files and immediate storage.

If you want an excellent balance between performance, price and capacity, stay with the 1 TB Fusion drive. Again, store media externally.

If you don’t plan to purchase external storage – and you will, you just don’t know it yet – get the 3 TB Fusion drive. (An extra TB for $100 makes this a better value than the 2 TB Fusion drive.)

One of my systems has a 3 TB Fusion drive. Currently, I’m using 600 GB of it. The rest is sitting around idle. When using external storage, you really don’t need lots of internal storage.

If you just want maximum performance from your storage, get the 1 TB SSD. It’s pricey, but it’s speed will make you giggle.

Apple notes: “For the best performance, iMac systems with 32GB or more of memory should be configured with a 2TB or larger Fusion Drive or all-SSD storage.”

NOTE: Apple’s marketing materials now define a terabyte as one trillion bytes. This means that when a disk is formatted, its storage capacity will be less than 1 TB because of the differences between how marketing and engineering calculate disk sizes.

WHICH GPU?

Configuring the GPU (Graphics Processing Unit) is now done when you pick the initial iMac, rather than as a build-to-order option within each iMac family. So, much though I would like to pick the mid-range system and add a high-end GPU into it, we no longer have that option.

Which is a shame. Because while we don’t need the high-end CPU system for most video editing, we would significantly benefit from the high-end 580 GPU in any system.

Both Final Cut and Premiere are increasingly using the GPU for most editing tasks, because the GPU is much faster than the CPU at rendering bitmapped images. Therefore, the best choice is the high-end GPU. The high-end GPU also includes 8 GB of video memory (VRAM).

However, the mid-range system with the Radeon Pro 575X is a perfectly adequate choice.

NOTE: The difference between the 575X and 580X is performance. The 575X has a peak performance of about 4.5 Teraflops, while the 580X supports up to 5.5 Tflops. Both will handle video just fine. All of the Radeon chips support OpenCL and Apple’s Metal and up-coming Metal 2 GPU computing API.

Here’s a link to learn more about Radeon’s GPU chips.

NOTE: Again, if you are principally doing video compression, the GPU speed is less important than the CPU speed. So, compressionists don’t need as high-performance a GPU as an editor.

UPDATE: When looking at GPU performance, use the specs for Metal or Metal II. OpenCL will not be supported going forward. Also, while eGPUs are attractive, I don’t see them, yet, as a big enough benefit for iMacs. eGPUs are principally designed for laptops.

HOW MUCH RAM?

Both Final Cut and Premiere will use as much RAM as you can afford.

Based on my tests with the 2016 MacBook Pro, I recommend a minimum of 16 GB of RAM, though, all my systems here have 32 GB. Again, if you have the money, max out the RAM. However, 32 GB of RAM will be sufficient for virtually all projects.

HOW MUCH SHOULD I SPEND?

You are going to be using this computer for four years. Spend what you can afford, but don’t be stingy in areas that matter: GPU and RAM.

All the base systems are fine, But, depending upon your needs, you can tweak the configurations to better match what you want the systems to do. All systems feature wireless mice and keyboards; though, in my office, I prefer my mice and keyboards wired.

NOTE: Apple has not yet delivered the Touch Bar on any stand-alone keyboards.

If it were my money and I was doing video editing on a budget, here’s what I would get:

Total: $2,499 (you’ll still need to spend additional money for 3rd-party RAM)

However, I wish that Apple made the Radeon 580X available on the mid-range unit.

If it were my money and I was doing mostly video compression, I’d get the high-end Mac mini. (This, in fact, is what I did personally.) Here’s an article that explains this in more detail.

As always, I’m interested in your opinions.


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316 Responses to Configure a 2019 iMac for Video Editing [u]

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  1. Hi Larry,

    A great article, which of course has left me having questions.

    I don’t really like having to edit videos on my late 2017 MBP, so am looking to upgrade my 2013 21″ iMac to the latest 27″.

    I will most likely go for the top spec ‘3.6GHz 8-core 9th-generation Intel Core i9 processor, Turbo Boost up to 5.0GHz’ with 8GB or RAM (and upgrade myself to 40GB), and a 512GB SSD drive.

    My main questions is regards the GPU. Would you think that it will most likely be good enough going for the standard 580X GPU, or is there a massive difference upgrading that to the Vega 48?

    Does the 580X work well with the i9 or is it better with the i9/Vega 48 combo?

    Thanks,
    Nick

    • Larry says:

      Nick:

      The only difference between the 580X and the Vega 48 is the speed at which they work. The image quality is the same.

      If you have the money, get the Vega 48. If budgets are a bit tighter, you’ll be fine with the 580X. Worst case, you can always add an eGPU later, running whatever is the top-end GPU at that time.

      Larry

  2. Anthony Messina says:

    Awesome article!! Looking at 27″ iMac for fcp X. Mostly editing and compression with compressor. Hope to use after effects more in the future. From what I gather when choosing the GPU, speed is the only difference? Trying to decide between 580X Or upgrade to Vega 48. I have no deadlines as I do this for fun at the moment. I may have answered my own questions but I thought I would ask. Thank you so much!

  3. Bill Ehman says:

    Hello Larry, thank you for your insight over the years. I am deciding which iMac model to get and like you mentioned I do think the mid-range one would be sufficient.

    However, I see for $300 more, you do get the 580X graphics processor with 8GB of memory instead of 4GB, but I think the bigger deal is you get an extra TB on the Fusion drive and with that you get a 128GB SSD instead of 32GB.

    In addition, Apple states that “For the best performance, iMac systems with 32GB or more of memory should be configured with a 2TB or larger Fusion Drive or all-SSD storage.”

    I planned on getting 32GB of memory on my iMac, so with this info and the other reasons above I guess I’ll have to spend the extra money as I don’t want to regret it later. With Apple Care and tax its almost $3,000 which is much more than I want to spend. Now I have to get the courage to hit the buy button!

    • Larry says:

      Bill:

      The absolute Number One Rule in buying computers is: “There’s always something better.” Always.

      The key is to buy the best you can afford, then relax about it. Anything you get will do a fine job.

      Yes, I recommend 32 GB. Then, note the words “for best performance” – this means that you will get perfectly fine performance, but not “the best” with a smaller Fusion drive. All the extra money is doing is buying more speed. If speed isn’t critical, you can save some money.

      Larry

      • bill says:

        Yes Larry I do agree. Honestly speed is important but not critical. I’m operating on a late 2012 iMac and just edited two projects shot in 4K…can you say “molasses?”

        I wouldn’t mind having a sports car for a change just to see what I’ve been missing. Thanks again and we appreciate your information!

        • Larry says:

          Bill:

          Smile…. there is a big gap between “want” and “need.”

          I always wanted to own a sports car – only to discover I was too tall to fit. Sigh…

          Anything you buy will be faster than what you have – and will definitely feel like a sports car.

          Larry

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