Apple introduced the iMac Pro in December 2017, after first announcing its plans to build the ultimate iMac for creative pros in April of that year.
It's a Space Grey beast of a machine with an 8-core 3.2GHz Intel Xeon W processor as standard that can turbo boost to 4.2GHz (build-to-order options go up to 18-cores), and it has won rave reviews.
However, more than a year and a half later, the super-powerful new Mac Pro has been announced, and following its March update the iMac (reviewed here) is now more powerful than ever. As a result the iMac Pro has lost much of its appeal.
Apple could continue to neglect the iMac Pro as it focuses attention on the upcoming Mac Pro, but it seems unlikely that 2019 will close with no update to what would by then be a two-year-old machine. So, on that basis, what can we expect from the next update to the iMac Pro? Read on to find out.
iMac Pro 2 Release date
We are assuming that Apple will be using Intel's next generation of Xeon W processors in the new iMac Pro - Cascade Lake W chips.
Intel rolled out a number of new Cascade Lake Xeon processors at the beginning of April 2019, however, the W mode didn't launch until June 2019. We have more on Intel's new Cascade Lake W chips below.
With those new chips available it is a surprise that Apple didn't launch a new iMac Pro at WWDC in June. It seems likely that Apple wanted attention focused on the Mac Pro, which was unveiled at that event.
In the past year Apple has taken to announcing product updates in the weeks running up to its events, so it could be that we will see a new iMac Pro launch in the run up to the September iPhone event.
iMac Pro 2 Price
The iMac Pro price currently starts at £4,899/$4,999.
It is likely that the UK price of the iMac Pro will adjust due to inflation, as the prices of the MacBook Pro did, and as we anticipate the iMac prices will. As a result it is likely that the UK price of the new machine will be £4,999. The US price will probably remain the same.
That might seem like a high price, but when you consider that the current top-of-the-range 27in iMac can be specced-up with an 8-core 3.6GHz 9th-gen processor and other pro-focused features to the tune of £4,544/$4,849, there are two similarly priced machines aimed at a similar audience.
And the price comparisons don't stop there. The entry-level Mac Pro, when it launches in the autumn will start at $5,999/£5,999 (UK price TBC).
Apple may choose to further differentiate the prices of these three Macs by dropping the iMac Pro price slightly, but it is unlikely.
iMac Pro 2: Design
When it launched in 2017 the only outward design change for the iMac Pro was the Space Grey colour and this is unlikely to change.
The 2017 iMac Pro might have maintained the iMac look, but Apple made changes to the inside. These changes helped accommodate a cooling system that included a high-capacity heat sink and extra venting to allow 75% more airflow and an 80% increase in thermal capacity, as well as using 67% less power than the standard 27in iMac.
That was quite a feat, and we think that the iMac Pro is unlikely to receive a redesign so soon after it launched (especially as Apple hasn't yet redesigned the standard iMac).
However, with Apple having reduced the bezels on the MacBook Air, iPhone and iPad in the last few years, we think it's time that Apple reduced the bezels of the iMac Pro. It's feasible that we could see a 30in display on a similarly sized iMac if Apple did reduce the bezels.
iMac Pro 2: Screen
Speaking of the display, the company could also look towards upping the pixel count of the iMac Pro's 5K display.
When the company unveiled the new Mac Pro it also unveiled a new Apple Display. The Pro Display XDR is 32in and offers 6K (6016 x 3384) resolution. Apple's XDR 6K Display also features a lot of other impressive tech, along with an astonishingly high price of $4,999.
The current iMac Pro has the same 5K, 5,120 x 2,880-pixel resolution screen as that on the current iMac. It’s a great screen but there is room for improvement. Just by reducing the bezels Apple could increase the size of the screen without the dimensions of the iMac changing. With many pro-focused monitors bigger than 30in the 27in iMac's screen is small by comparison.
Looking at some of the monitors on the market, there are a couple of areas where we could see change.
The current model offers 500 nits. Nits is a measurement of brightness. Apple's Pro Display XDR can put out an impressive 1,000 nits of sustained brightness.
Even HP’s Book Studio x360 has a 600-nit display and Dell’s Ultrathin 24-inch and 27-inch monitors also offer 600 nits.
Those HP and Dell displays also offer 85% DCI-P3 coverage. Since 2015 Apple has supported P3 wide-gamut colour space, which is an RGB colour space developed for the movie industry. Apple’s Display P3 is a little different to the movie industry’s DCI-P3.
Some critics of P3 complain that it is smaller than Adobe RGB in the cyan and green area so it covers less of typical CMYK printer colour spaces.
The Dell Precision 5530 manages to cover 100% of Adobe RGB, apparently.
Adobe RGB has been the de facto standard for a long time - but many also consider sRGB (standard RGB) to be sufficient, and Apple’s displays already exceed the colour gamut of sRGB.
Another area where we could see improvements is in 10-bit. Apple’s iMac Pro screen supports 10-bit spatial and temporal dithering - which means that despite being an 8-bit monitor, it is able to display 10-bit colour by switching some pixels very very quickly.
The Dell Precision 5530 claims to support true 10-bit colour, while Apple's own Pro Display XDR offers 10-bit colour.
The current iMac Pro uses the Xeon W-200 series, based on the 14nm Skylake server microarchitecture and using the Purley platform.
2017 models are as follows:
- 8-core 3.2GHz Intel Xeon W (TB 4.2GHz) 19MB cache (Xeon W-2140B)
- 10-core 3.0GHz Intel Xeon W (TB 4.5GHz) 23.75MB cache (Xeon W-2150B)
- 14-core 2.5GHz Intel Xeon W (TB 4.3GHz) 33.25MB cache (Xeon W-2170B)
- 18-core 2.3GHz Intel Xeon W (TB 4.3GHz) 42.75MB cache (Xeon W-2191B)
The Xeon W family replaced the Xeon E5 which features in the current Mac Pro. Xeon was a new brand for workstation-class processors that sit between server and consumer use.
Looking to the future, the Skylake versions of the Xeon W family will be succeeded by Xeon W processors based on the Cascade Lake 14nm microarchitecture. The Cascade Lake Xeon W was expected to be released in mid-2018 - however, it was delayed until 2019. Like Skylake, Cascade Lake based on the Purley platform.
At the beginning of May 2019 details of these new Cascade Lake processors were leaked in a Chinese webforum, via Tom's Hardware.
The details include the name: Intel Xeon W-3275. They have up to 28 cores and 56 threads. The maximum frequency is 4.6GHz with 38.5 L3 Cache. The line up should look something like this:
- Intel Xeon W-3275, 28 cores, 4.6GHz
- Intel Xeon W-3265, 24 cores, TBC
- Intel Xeon W-3245, 16 cores, TBC
- Intel Xeon W-3235, 12 cores, TBC
- Intel Xeon W-3225, 8 cores, TBC
- Intel Xeon W-3223, 8 cores, TBC
The Cascade Lake Xeon W will also address Spectre and Meltdown, as well as add support for DDR-T Optane DIMMs and 2933 MT/s DDR4 (up from 2666 MT/s), more on that below.
Following Cascade Lake W will come Ice Lake W which will use a 10 nm process and will move from the Purley platform (also known as Xeon Scalable CPUs) to the Whitley platform - but that won’t appear until later in 2019 or 2020.
iMac Pro 2: Graphics
When it shipped in 2017 the iMac Pro had the option of the Radeon Pro Vega 56 with 8GB HBM2 memory, or the Radeon Pro Vega 64 with 16GB HBM2 memory. Apple later added the Radeon Pro Vega 64X with 16GB of HBM2 memory as an option (for an extra £630/$700).
What graphics treats could be in store for the next version of the iMac Pro
The Mac Pro will offer a number of Graphics options, starting with the AMD Radeon Pro 580X.
A possible contender for the new iMac Pro include the Radeon Pro Vega II or the Radeon Pro Vega II Duo.
iMac Pro 2: RAM
The new Cascade Lake Xeon W processors mentioned above will also bring changes to the RAM in the next generation of the iMac Pro.
The Cascade Lake Xeon W will add support for DDR-T Optane DIMMs and 2933 MT/s DDR4 (up from 2666 MT/s).
Intel has already announced that Optane DIMMs are arriving in the second half of 2018.
Optane DIMMs will:
- Bring increased memory density
- Be as fast as DDR4 memory
- Be able to retain information without power
Traditionally you couldn’t have one without the other, it was a case of using slower NAND for data retention, or DRAM for speed.
The current iMac Pro line up offers:
- 32GB of 2666MHz DDR4 ECC memory
- 64GB of 2666MHz DDR4 ECC memory
- 128GB of 2666MHz DDR4 ECC memory
We'll update this article as soon as we learn more about the future components of the iMac Pro.