ASRock Z370M Pro4

The last few boards from ASRock will be of the small form factor variety. We normally do not see too many options in this space, especially close to the chipset launch. ASRock got a head start with shrinking the ATX sized Pro4 to the micro-ATX format and calls it the Z370M Pro4. The Z370M Pro4 uses the same power delivery setup as the full-sized twin, albeit on a shorter board. Even though its smaller in size, there are two full-length PCIe slots as well as two M.2 slots. It looks to have very similar features, just in a smaller package.

For aesthetics, a gray color runs across the board from the top of the audio section through the PCIe area and past the chipset to the edge of the board. The chipset heatsink gets much smaller on the micro-ATX version due to the less free real estate on the smaller board. Outside of that, we get the same single VRM heatsink, the same capacitors, and the same vanilla appearance. Users will not find an RGB LED on the board, nor a header to add one.

Even in mATX form, we get four memory slots which handle up to 64GB, with a rated supported speed up to DDR4-4300. There are two full-length PCIe slots, the first from the CPU at x16 and the second from the chipset at x4, and two open-ended x1 slots to round out PCIe connections. 

Six SATA ports can be found on the board, with four mounted horizontally and two vertically a bit further up the board. All the SATA ports support RAID 0, 1, 5, and 10. The Z370M Pro4 also has two M.2 slots, with both able to fit an 80mm module. The first M.2 slot is SATA only while the second supports PCIe. Due to lane sharing, if the first M.2 socket is occupied by a SATA type M.2 device, SATA 0 will be disabled.

The board has four fan headers, two for the CPU (1 x 3-pin, 1 x 4-pin) and two 4-pin chassis fan connectors that auto-detect if a three or four pin fan is in use. Audio duties are taken care of by the Realtek ALC892 codec and uses ELNA audio caps. Network support is handled by a single Intel I219-V GbE. Thunderbolt support is not found on the Z370M Pro4.

USB support on the back panel consists of four USB 3.1 (5 Gbps) Type-A ports and one Type-C port. Additionally, there is one USB 2.0 port. The rest of the back panel IO contains separate PS/2 ports for mouse and keyboard, D-Sub/DVI-D/HDMI video outputs, Intel gigabit Ethernet, and the three-jack audio stack. 

ASRock Z370 Taichi ASRock Z370M-ITX/ac and Z370 Gaming-ITX/ac


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  • risa2000 - Saturday, October 21, 2017 - link

    It seems that the PCB which holds the silicon has changed between the 7th and the 8th gen. So they most likely needed to validate the CPU. The fact that they did not move the notch means they just did not want to (could not) introduce a new socket. Either because there were so many of the old ones, or there was no time, or they did not want to push the cost to MB manufacturers to revalidate the new sockets. Reply
  • shabby - Friday, October 20, 2017 - link

    For a split second i thought finally some x370 goodness... but no.
    Shame, shame, shame!
  • tamalero - Saturday, October 21, 2017 - link

    I'm waiting for actual non clown disco BS Threadripper motherboards :( Reply
  • ikjadoon - Friday, October 20, 2017 - link

    Amazingly well done. Excellent write-up. Reply
  • AbRASiON - Friday, October 20, 2017 - link

    Stupid question, I got the AsRock simple ITX board and it won't turbo my CPU at all (8400) like no turbo PERIOD. It never ever goes over 2763mhz?

    Anyone got any ideas on this? Am I just stupid and this is normal behaviour or what?
  • bernstein - Friday, October 20, 2017 - link

    FYI: GIGABYTE Z370N-WiFi is also HDMI 2.0 capable Reply
  • npz - Saturday, October 21, 2017 - link

    Thanks for that info. HDMI 2.0 is a rarity and I've held off Coffee Lake as I research boards with it.
    So far:
    - GIGABYTE Z370N-WiFi
    - Asrock Fatal1ty Z370 Gaming-ITX/ac (not explicitly stated but the last z270 version had it and it's implied by "- Supports HDMI with max. resolution up to 4K x 2K (4096x2160) @ 60Hz")
    - EVGA Z370 Classified K

    so I think the article's table should be updated to reflect this.

    with the EVGA Z370 Classified K being the only full size or 4 dimm slot mobo with HDMI 2.0

    HDMI 2.0 is important not only for the 60hz support but one of the requirements for Playready 3.0 DRM used by 4k media e.g. Netflix, Amazon, is that ALL displays ports on the system needs to support hdmi 2.0 with hdcp 2.2. So if you want to enable the CPU's GPU with a discrete card or use an AMD card, then onboard HDMI 2.0 is a must to playback 4k content.
  • awehring - Sunday, October 22, 2017 - link

    I agree, that HDMI 2.0 is important.

    But everyone must take care: The Asrock Z370M ITX/ac (non Gaming) supports only HDMI 1.4. Asrocks specification state “Supports HDMI with max. resolution up to 4K x 2K (4096x2160) @ 30Hz“. The Gaming variant supports HDMI 2.0.

    @Ian: I think it's worth to be mentioned in the description of th boards as well as in the selection table at the last page.
  • Byte - Friday, October 20, 2017 - link

    If nothing else, Asus makes some damn good looking boards. Reply
  • docbones - Friday, October 20, 2017 - link

    My big question still on the z370 is whats the 390 going to bring? Will the 370 not support a octocore chip? Reply

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