There's a lot of love for mini-ITX, and our next review is the ASRock Z370 Gaming-ITX/ac. This gaming-centric board offers users a number of features which make it highly competitive in the small-form-factor overclocking space at $180. Despite the small size, the board includes Thunderbolt 3, HDMI 2.0, Intel-based Wi-Fi and LAN, USB 3.1 support, M.2 storage, and six SATA ports - a rarety on a small motherboard. If everything else goes right, it could be a good contender for a sharp build.

ASRock Z370 Gaming-ITX/ac Overview

We've looked at a number of small form factor motherboards of late, and this one from ASRock is firmly in the 'Gaming' pile. The board comes with a single full-length PCIe slot which is reinforced to better support heavier video cards, but it also supports bifurcation using a riser card to extend one x16 slot to two x8 slots (no other Z370 based Mini-ITX board is able to do this). ASRock seems to have built the board with expansion in mind, with Thunderbolt 3 also featuring on the build through Intel's Alpine Ridge controller, which means it also supports USB 3.1, Displayport over Type-C, and Power Delivery 2.0 up to 36W.

The 7-phase power delivery is capable of handling any current Coffee Lake CPUs on the market, both at stock speeds and overclocked without breaking a sweat according to our testing. As always with ASRock boards, DRAM support is high, and this board and can support 2x16 GB of memory, and is rated up to DDR4-4333. The high-end Realtek ALC1220 audio codec is bolstered with Nichicon Audio caps and a Texas Instruments NE5532 OpAmp for the front panel. Storage capabilities on the SATA front shouldn't be an issue with the board making room for all six ports native to the Z370 chipset. The board also includes a single M.2 slot for highspeed storage. ASRock also adds a bit of flare to the board with three RGB LEDs located below the PCIe slot on the back of the board. In all, not too much is missing compared to its full-size counterparts and is a well-appointed motherboard. 

Overall performance in the ASRock Z370 Gaming-ITX/ac was good landing on the middle of most of our tests compared to other 300-series motherboards. The small board excelled in power use, particularly on load, where it was used the least amount of power of all Z370 series boards. The board also takes the crown of the fastest board to boot taking less than 18 seconds to get through POST before the OS drive takes over and loads Windows. We saw above average results in both 7-Zip and 3D Particle Movement testing with the board using its Multi-Core Enhancement (enabled by default) to stretch its legs a bit, running these tests at 4.7 GHz and 4.4 GHz cache. Overall, a very good showing in the performance and power metrics. 

Our overclocking results worked out as expected and topped out at our 5.1 GHz clock speed. Any more than that and we have really breached the 90C threshold we set for ourselves. The Gaming-ITX/ac was the first board we have tested to show a fair amount of vdroop so those who prefer to see load voltage close to what was set in the BIOS, will have to set Load Line Calibration to Level 1. Also, once we hit the 5 GHz mark, we started to see power limit throttling during testing. A quick adjustment of that option in the BIOS and that behavior was eliminated. Auto overclocking through the EZ Mode yielded a 4.5 GHz all core result with a -2 AVX offset.  Overall the board handled what we could throw at it with little fanfare, just how most enthusiasts like it. 

The ASRock Z370 Gaming-ITX/ac is currently priced at $180 on This price point puts it square in the crosshairs of the MSI Z370I Gaming Pro Carbon AC at $170, the ASUS ROG Strix Z370-I gaming at $202, as well as the slightly lower priced GIGABYTE Z370N WIFI at $150. The biggest difference between the boards will come from SATA ports (this has six, the other boards listed run with four), M.2 slot count (the GIGABYTE and ASUS offerings have two, this only has one), as well as video outputs. The ASRock Z370 Gaming-ITX/ac is the only board of those listed with Thunderbolt 3, which for TB3 users is a big value-add, and also has HDMI 2.0 support.

ASRock's Z370 Strategy

ASRock has almost a dozen motherboards in their Z370 stable, covering motherboards of all sizes and price brackets. At entry level into the platform, ASRock offers their Z370M Pro4 MicroATX board starting at $110. The flagship board in the mainstream platform is the Professional Gaming i7 coming it at $287+. Between those are two Mini-ITX boards, with the rest being ATX, all offering different feature sets and aesthetics. 

ASRock Z370 Motherboard Lineup
  Size AnandTech
Amazon Newegg
Z370 Professional Gaming i7 ATX   $296 $287
Z370 Taichi ATX [in testing] $238 $227
Z370 Gaming-ITX/ac mITX [this review] $180 $180
Z370 Gaming K6 ATX   $199^ $170
Z370 Extreme 4 ATX   $186^ $157
Z370 Killer SLI/ac ATX   $179 $160
 Z370 Pro4 ATX   $130 $130
Z370 Killer SLI ATX   $260^ -
 Z370M-ITX/ac mITX   $151 $205^
Z370M Pro4 mATX   $110 $110

^ - 3rd party seller

Information on Intel's Coffee-Lake CPU Desktop Processors

One important piece of information to note: technically these processors use the LGA1151 socket, also used by 6th and 7th Generation processors using the Z170 and Z270 chipsets. But due to several (albeit minor) difference in the pin-layout of these two sets of processors, the 8th Generation Coffee Lake will only work in Z370 boards and are not cross-compatible. Back in October 2017, Ian Cutress reviewed a couple of processors (i7-8700K and i5-8400) in the Coffee Lake lineup - details on the rest of the product stack are listed below.


The ASRock Z370 Gaming-ITX/ac Review

In this review, we have the following pages:

  1. Overview
  2. Visual Inspection
  3. BIOS and Software
  4. Board Features
  5. System Performance
  6. CPU Performance
  7. Gaming Performance
  8. Overclocking
  9. Conclusions
Visual Inspection
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  • hansmuff - Saturday, July 14, 2018 - link

    Could you please tell me which program you use to check DPC latency? Thank you kindly!
  • Joe Shields - Monday, July 16, 2018 - link

    LatencyMon -
  • Vanguarde - Saturday, July 14, 2018 - link

    If this is typical ASrock quality, the board will fail twice in one year like my previous board did, with a nightmare RMA process.

    Will never do business with ASrock again. Sticking with the adults at Asus.
  • dubyadubya - Saturday, July 14, 2018 - link

    Must have been a fluke. My Z97 Extreme 6 is over 4 years old and is still rock solid. I have built 3 or 4 systems using Z97 Extreme 4's for friends, all still running never a problem. I had a Asrock micro ATX board I gave to a friend years ago, can't remember the model (Intel Core 2 vintage) that's still running to this day. Knock on wood. So you were just unlucky IMHO.
  • Holliday75 - Monday, July 16, 2018 - link

    One board does not represent an entire company. One RMA process issue does not as well.

    No company in the history of companies has had a 100% production rate. When doing large end user deployments in the past we considered anything with a DOA rate under 3% to be wonderful. That's 3 dead laptops, desktops, etc per 100. Worst one was Toshiba with a DOA rate of 8% on a 1000 laptop deployment. Ew. Anyway you have to step back and look at it from a much wider angle.

    ASRock has been solid for me over the years. I have no complaints. Rocking a 5 year old rig with one right now and know plenty of people who have had no issues. I know they are not perfect.....nobody is.
  • gehex1 - Saturday, July 14, 2018 - link

    for all your cooperate espionage and monitoring, locate dating scams and do deep background check. d a r k w e b s o l u t i o n s . co
  • - Sunday, July 15, 2018 - link

    Ok, almost perfect. Now a mini itx threadripper board with thunderbolt.

    Only, when hell frezes over right?
  • mkaibear - Monday, July 16, 2018 - link

    Are you mad, man???

    Threadripper is an *enormous* socket;

    That's it on a mATX board...

    To get x299 on a mini itx board and keep the quad channel RAM they had to shift to SODIMMs, unless you're putting the RAM on the backside of the board I can't see how they could do a quad channel TR board..

    Just stick with microATX and add TB via a PCIe card!
  • f18ccx - Monday, July 16, 2018 - link

    I have this board, everything about it is excellent except the 1.5v DDR voltage limit. My B-Die G.Skill 3200 Mhz RAM has a lot more in it than 3866/CL15. If you reading, ASRock, please give us more to play with.
  • Dug - Friday, July 27, 2018 - link

    Why is Non-UEFI POST Time used?
    Is there a way to find out fastest boot time?

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