Small form-factor (SFF) machines have emerged as a major growth segment in the desktop PC market. Performance per watt is an important metric for such systems, and Intel has pretty much been the only game in town for such computers, given that AMD platforms prior to the launch of Ryzen could barely compete on that metric. The NUC (UCFF) and mini-STX (5x5) were introduced by Intel as the standard motherboard sizes for the SFF market, and we have previously seen AMD-based NUC-like platforms (namely, the Zotac ZBOX CA320 nano back in 2014, and the Compulab fitlet-XA10-LAN in 2016).

Not to be left out entirely, however, AMD's vendors are finally starting to dip their toes back in to the mini-PC market with Ryzen-based systems. Earlier this year, ASRock became the first vendor to announce an AMD-based mini-STX system - the DeskMini A300. So for today's review we're delving deep into the performance and features of the DeskMini A300, and seeing how it stacks up against other contemporary SFF PCs.

Introduction and Platform Analysis

ASRock's DeskMini series is a family of barebones systems in the mini-STX (140mm x 147mm motherboard / 1.92L chassis) and micro-STX (188mm x 147mm motherboard / 2.7L chassis) form-factors. Here, 'barebones' differs slightly from the NUC terminology. While the NUCs just require the user to plug in RAM and storage, the mini-STX and micro-STX boards are socketed. This gives users a choice of CPU to install, making it similar in more respects to a typical DIY build.

The DeskMini A300 that we are looking at today is a mini-STX machine capable of supporting AMD AM4 processors with integrated graphics. The board uses the AMD A300 chipset, and supports both Ryzen-based Raven Ridge APUs and the older Bulldozer-based Bristol Ridge APUs with a TDP of up to 65W.

There are multiple versions of the DeskMini A300 available, depending on the optional components that are bundled. The product page mentions the DeskMini A300 and the A300W, with the latter's accessory pack including an Intel AC-3168 Wi-Fi kit. On the Overview page, however, a number of optional components are mentioned - an AMD APU cooler (for up to 65W, with a dimensions of 77mm x 68mm x 39mm and speeds between 1950 and 3500RPM), a VESA mount kit, a M.2 Wi-Fi kit, and a USB 2.0 cable to put the dual USB-port slots on the top / side of the chassis to use.

It must be noted that the chassis design only allows for coolers up to 46mm in height - this means that the Wraith coolers (Stealth @ 54mm, Spire @ 71mm, and the Max @ 85m) are all unsupported. Users might be better off the optional cooler that ASRock advertises for use with the DeskMini A300.

Overall, our barebones review sample came with the optional cooler in the package. ASRock also provided us with an AMD Ryzen 5 2400G APU to install in the system. We completed the build with a 500GB Western Digital WD Blue SN500 NVMe SSD and a 16GB G.Skill Ripjaws DDR4-3000 SODIMM kit.

The specifications of our DeskMini A300 review configuration are summarized in the table below.

ASRock DeskMini A300 Specifications
Processor Ryzen 5 2400G
AMD Zen, 4C/8T, 3.6 (3.9) GHz
2MB+4MB L2+L3, 65 W TDP
Memory G.Skill Ripjaws F4-3000C16D-16GRS DDR4 SODIMM
16-18-18-43 @ 3000 MHz
2x8 GB
Graphics Radeon RX Vega 11 Graphics
Disk Drive(s) Western Digital WD SN500
(500 GB; M.2 2280 PCIe 3.0 x2 NVMe SSD; SanDisk 64L 3D TLC)
Networking Realtek RTL8168 (MAC) / RTL8111 (PHY) Gigabit Ethernet controller
Audio 3.5mm Headphone / Microphone Jack
Capable of 5.1/7.1 digital output with HD audio bitstreaming (HDMI)
Miscellaneous I/O Ports 1x USB 2.0
2x USB 3.0 Type-A, 1x USB 3.1 Gen 1 Type-C
Operating System Retail unit is barebones, but we installed Windows 10 Enterprise x64
Pricing $150 (barebones)
$465 (as configured, no OS)
Full Specifications ASRock DeskMini A300 Barebones Specifications
Thanks to Western Digital and G.Skill for the build components.

Similar to the other DeskMini systems, the A300 is equipped with two DDR4 SO-DIMM slots (supporting DDR4-2400 with Bristol Ridge APUs, and DDR4-2933 with Raven Ridge). There are two M.2 2280 slots on board (one on the same side as the CPU socket, and another on the underside). This is in contrast to the Intel-based DeskMini 310 board which comes with just a single M.2 slot. The two M.2 slots are PCIe 3.0 x4. However, if the Athlon 2xxGE series APUs are used, the second slot operates in PCIe 3.0 x2 mode.

Other features are similar to the DeskMini 310 - two SATA ports and space in the chassis for the installation of two 2.5" SATA drives, a Realtek ALC233 audio codec chip to support a headphone / microphone audio-jack, two USB 3.0 Type-A ports, one USB 3.1 Gen 1 Type-C port, and a single USB 2.0 Type-A port. The 120W (19V @ 6.32A) power adapter is external. The LAN port is backed by a Realtek RTL8168/8111H controller compared to the Intel I219V in the DeskMini 310.

The package includes the drivers on a CD (a USB key, even read-only, is much more preferable), a quick installation guide, screws to install the storage drives, rubber feet to raise the chassis when it is placed vertically, a couple of SATA cables, and a geo-specific power cord.

In addition to the extra M.2 2280 NVMe SSD slot, the DeskMini A300 scores over the DeskMini 310 by sporting a native HDMI 2.0a display output. Note that HDMI display output support on Intel processors is restricted to HDMI 1.4a. Vendors wanting to implement a HDMI 2.0a port in their system have been forced to place a LSPCon on board to convert on of the Display Port 1.2 outputs from the processor to HDMI 2.0a, which results in increased board costs. Since the target market for the DeskMini 310 could make do with a single 4Kp60 output using the DisplayPort port, ASRock didn't bother to place a LSPCon on that board. The DeskMini A300 supports simultaneous dual 4Kp60 displays using the DisplayPort and HDMI ports in the rear. Triple display output is also supported, but the D-Sub port can support only a 2048 x 1536 resolution at the maximum.

The gallery above takes us around the chassis design and the board features. Without the Wi-Fi antenna pigtails to worry about, it was a breeze to draw out the board from the chassis and install the components.

The DeskMini A300 comes with an AMD A300 Promontory chipset. It is the most basic offering from AMD in the AM4 lineup. Overclocking is not supported. There are no USB 3.1 Gen 2 ports, and StoreMI (storage acceleration using a combination of PCIe and SATA drives) is also not supported. From the AIDA64 system report, we see that the second M.2 2280 port (on the underside of the board) is enabled by the x2 / x4 NVMe link from the processor. The remaining 12 free PCIe lanes from the Ryzen 5 2400G are configured as two x4 links for the M.2 slots on the top side (Wi-Fi and storage). The remaining x4 link is used in a x1 configuration for the Realtek LAN controller. All the rest of the I/O ports (USB and SATA) are direct passthrough from the SoC portion of the Ryzen 5 2400G.

Moving on to the BIOS features, the use of the A300 chipset rules out any overclocking of the Ryzen processor itself. Upon boot up, our configuration came up with the G.Skill SODIMMs in DDR4-2400 mode. The BIOS allowed us to load the available XMP profile (DDR4-3000), and a simple saving of the change followed by a power cycle resulted in the DRAM configured for 3000 MHz operation.

Our review sample shipped with the BIOS v1.2. Prior to benchmarking, we upgraded to the recommended version, 3.40. Screenshots from both BIOS versions can be seen in the gallery above.

In the table below, we have an overview of the various systems that we are comparing the ASRock DeskMini A300 against. Note that they may not belong to the same market segment. The relevant configuration details of the machines are provided so that readers have an understanding of why some benchmark numbers are skewed for or against the ASRock DeskMini A300 when we come to those sections.

Comparative PC Configurations
Aspect ASRock DeskMini A300
CPU AMD Ryzen 5 2400G AMD Ryzen 5 2400G
GPU AMD Radeon RX Vega 11 Graphics AMD Radeon RX Vega 11 Graphics
RAM G.Skill Ripjaws F4-3000C16D-16GRS DDR4 SODIMM
16-18-18-43 @ 3000 MHz
2x8 GB
G.Skill Ripjaws F4-3000C16D-16GRS DDR4 SODIMM
16-18-18-43 @ 3000 MHz
2x8 GB
Storage Western Digital WD Blue WDS500G1B0C
(500 GB; M.2 2280 PCIe 3.0 x2; SanDisk 64L 3D TLC)
Western Digital WD Blue WDS500G1B0C
(500 GB; M.2 2280 PCIe 3.0 x2; SanDisk 64L 3D TLC)
Wi-Fi N/A N/A
Price (in USD, when built) $150 (barebones)
$465 (as configured, No OS)
$150 (barebones)
$465 (as configured, No OS)

The rest of the review will deal with performance benchmarks - both artificial and real-world workloads, performance for home-theater PC duties, and an evaluation of the thermal design under stressful workloads.

BAPCo SYSmark 2018
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  • abufrejoval - Friday, April 26, 2019 - link

    Very nice review!

    But surprisingly little relative change (relative to publicity...) from the previous (major) iteration, which I interpret as the Kaveri vs. Skylake Iris Plus that I own and tested, A10-7850k vs. i5-6267U.

    Intel still seems to never use more than 15Watts for the CPU, yet manages scaling single to 4GHz at great IPC while it manages to sustain admirable Hertz even at multi-core constant loads, taking a nice sip of cool on every little stall. AMD seems to retain a much more linear efficiency curve where clocks and cores just eat power, while the difference at the wall plug is much smaller in this iteration (was 3:1 for exactly the same performance on my old systems).

    The good thing is that on a device like this, peak power is much less important than on a notebook, so it’s ok, as long as maintains quiet on constant peak and (finally) reaches acceptable idle: Here I see a lot of progress on AMD's side, Intel has much less room to beat itself.

    For graphics, bandwidth is so crucial and I wonder what the AMD could do with a bit of eDRAM, HBM or even a lower-power variant of GDDR5… but I guess the latency issues could kill browser performance and that is unfortunately a large chunk of what buyers would want these for…

    Still dreaming of a way to put well-proportioned APUs in a scalable system with 1x/2x/4x configs… With storage and RAM no longer eating box space, 75/150/300 Watt configs could be relatively small yet remain quiet.

    Speaking of idle power and quiet, this is where I get interested in the AMD. The NUC is great in everything but noise on peak load, but it would really only take a replacement top and a Noctua to make it great… There is so much space behind these giant 4k screens, nuc/NUC can become a little pointless.

    Good Linux support is where I am getting concerned. Current reports praise AMD on their Linux vision… but progress seems a very different story and one where Intel (sorry Charly), really shines, even Nvidia seems better in practical terms (sorry Linus). I’m also somewhat disheartened by power management there: Not sure I’ll be able to reach 10 Watt of idle on CentOS or Ubuntu *and* Steam/Vulkan performance comparable to Windows (it’s actually gotten quite good on bigger Nvidia GPUs, even GPU pass-through to a Windows VM is kind of fun).
  • sor - Saturday, April 27, 2019 - link

    As I mentioned probably as you were typing this, I ran Ubuntu straight out of the box and am getting nearly 50% better FPS than this review on Dota 2. Full vulkan support and max settings. Pleasantly surprised, I am used to having to tinker with drivers.

    Notably, I don’t think this would have been possible 8 months ago as only newer kernels have the good AMD support built in.
  • Pishi86 - Saturday, April 27, 2019 - link

    This is not exactly a fair comparison. You are comparing a desktop AMD chip with and a mobile Intel chip. Its kind of like comparing an i3 8100 vs a Ryzen 5 3500u. AMD's Ryzen 5 3550H and Ryzen 7 3750H would have been more competitive. These chips are about as fast as the 2400G, but with an maximum TDP of 35w. There are some reviews on Notebookcheck and these chips are consuming just over 70w underload. This is with a 15.6 1080P screen and a power hungry Radeon RX 560X. The power consumption and battery life is actually better than an i5 8300H and 1050 combo with an identical. Check out the review below.

    The truth is the onboard Vega on Ryzen is a very powerful iGPU held back by memory bandwidth. Unrestrained, its probably 80-90% as powerful as an RX 460. It has 640-704 Vega cores which are clocked higher (1.2-1.4GHz) than the 896 cores in the RX 460. Vega's IPC should be a bit above Polaris's.

    I agree with you Linux support is spotty, I am a Linux user myself and I am in the market for a new laptop, but I may have to buy Intel despite its weak iGPU. Unfortunately, you can't find anymore Iris powered laptops these days (outside the macbook pro). Also, even though its improved AMD's video decode/encode is not as efficient as Intel's. I am not even sure if Nvidia is as efficient as Intel in video playback. Having that said I would not trust Intel's UHD graphics powering a 4k monitor, which is what I am in the market for.
  • Pishi86 - Friday, April 26, 2019 - link

    Does anyone know if you could get a 3rd party power supply that's more than 120w? I mean 150w might be good, if AMD releases 95W APUs in the future. A 120W PSU might limit CPUs abover 65W.
  • Lucky Stripes 99 - Sunday, May 5, 2019 - link

    Yes, there are third party power bricks available that can supply more current. Just keep in mind that the power regulators on the motherboard may not be rated for that higher current and that you could shorten its life or run into stability issues if you attempted to use a more power hungry processor (assuming if the BIOS would even make it past POST with an unsupported processor).
  • Haawser - Saturday, April 27, 2019 - link

    Good luck buying one...Only EU retailers I could find seem to have sold out within hours. Still, will keep trying. As this is exactly the sort of SFF I've wanted since Ryzen APUs came out.
  • ganeshts - Saturday, April 27, 2019 - link

    On Amazon and Newegg, Computer Upgrade King seems to have lot of ready-to-go models with the DeskMini A300 ; Eg: (Just FYI - I have no idea about the reputation of this retailer. Just came up during my search on Google)
  • Haawser - Saturday, April 27, 2019 - link

    @ganeshts- Again, out of stock. Personally I think ASRock, Lenovo, HP, Zotac and everybody else that manufacturers SFF PCs have greatly underestimated the number of people looking to buy Ryzen APU based systems. And with the improved 3000 series (12nm Zen+ with soldered HS) soon available, the barebones will be even more sought after.
  • ganeshts - Sunday, April 28, 2019 - link

    Shows in-stock for me when I added to cart :
  • oliwek - Saturday, April 27, 2019 - link

    For people in NL or BE, I bought mine from here, delivered promptly :

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