ASRock AB350 Gaming K4 Board Features

While 2-way CrossFireX is technically possible with the AB350 Gaming K4, I would advise against it due to the bandwidth limitations on the second full-length PCIe slot; this is electrically wired to run at x4 mode at all times and shares bandwidth with the top M.2 slot.

ASRock AB350 Gaming K4 ATX Motherboard
Warranty Period 3 Years
Product Page Link
Price $90
Size ATX
CPU Interface AM4
Chipset AMD B350
Memory Slots (DDR4) Four DDR4
Supporting 64GB
Dual Channel
Up to 3200 MHz
Video Outputs HDMI 1.4, DVI-D, D-Sub
Network Connectivity Realtek RTL8111GR
Onboard Audio Realtek ALC892
PCIe Slots for Graphics (from CPU) 1 x PCIe 3.0 (x16)
1 x PCIe 3.0 (x4) - shares with M.2
PCIe Slots for Other (from PCH) 1 x PCIe 2.0 (x4)
4 x PCIe (x1)
Onboard SATA Four, RAID 0/1/10
Onboard M.2 1 x PCIe 3.0 x4 (top slot)
1 x SATA 6Gb/s (bottom slot)
USB 3.1 (10 Gbps) N/A
USB 3.0 (5 Gbps) 1 x Type-C
5 x Rear Panel (Type-A)
2 via Header
USB 2.0 2 x Type-A
4 via Header
Power Connectors 1 x 24-pin ATX
1 x 8-pin CPU
Fan Headers 1 x CPU (4-pin)
3 x System (4-pin)
IO Panel 5 x USB 3.1 Type-A (USB 3.1 Gen 1)
1 x USB 3.1 Type-C (USB 3.1 Gen 1)
2 x USB 2.0 Type-A
1 x Network RJ-45
1 x HDMI 1.4
1 x Combo PS/2
3 x 3.5 mm Audio Jacks

The emphasis is primarily on gaming with ASRocks contunuing partnership with Fatal1ty, for whatever that seems to be worth these days. $90 means there has to be some cut backs compared to the high-end products, so we see the audio/networking combination from Realtek which is often sold at a combined discount to motherboard manufacturers. 

Visual Inspection

The ASRock AB350 Gaming K4 does feature an element of customization through a set of red LEDs placed underneath the PCH heatsink which can be controlled via the BIOS, or with the ASRock RGB utility app. Users looking for RGB connectivity will be happy to know a single RGB LED header has been implemented, as well as a dedicated LED fan header. Following this, the AB350 Gaming K4 has a dedicated CPU fan 4-pin header with a further three 4-pin headers for system fans. Power to the CPU comes through an 8-pin 12V power connector with auxiliary power to the motherboard coming via the standard 24-pin ATX connector.

Memory support is a plenty and thanks to the wave of AGESA BIOS updates that rolled out last year. The four RAM slots operate in dual channel mode and has support for a total of 64 GB of DDR4 memory with speeds up to DDR4-3200.

Making up the power delivery on this board is an Intersil ISL95712 PWM controller with three initial drivers for the CPU which have doublers to make the total amount physical phases dedicated to the CPU at six. The ISL95712 on paper can only handle four in total, so an additional Intersil ISL6625 driver is featured. Sinopower SM4336 and SM4337 MOSFETs make up the SOC and CPU sections of the power delivery, which aren't the most efficient choices in the grand scheme of things, but these are more than capable of handling an eight core Ryzen CPU with a modest overclock such as the Ryzen 7 1700 used in our AM4 motherboard reviews. In addition to this, there is a single Anpec APW8720B driver taking care of the memory.

Just peering at the VRM heatsinks a little bit better, they don’t seem anything overly special, but they certainly kept their cool with our Ryzen 7 1700 running at 3.9 GHz. The only caveat with them is the use of plastic push pins which I’m not a massive fan of. Not just from a robustness/quality point of view, but they only apply so much pressure between them, the thermal pad and heatsinks themselves. MSI’s B350 Tomahawk uses screws and I much prefer this method of fixing to simple plastic pins. But everything has a price, right?

The PCI layout and configuration on the AB350 Gaming K4 gives two full-length PCIe slots, with the top one running at PCIe 3.0 x16 from the CPU and reinforced for heavy graphics cards. The second full-length slot is a PCIe 3.0 x4 connection, also from the CPU, but shares bandwidth with the top M.2 slot. The other four shorter PCIe slots are PCIe 2.0 x1 from the chipset.

Touching more on the storage options, ASRock has achieved dual M.2 ports on this board which if needed, is there to be used. This is something not usually seen on lower costed boards, but there is some sharing going on: if a user has a drive in the second M.2 slot at the bottom of the board, this slot shares lanes with the third SATA port and if one is in use, the other will be disabled and visa versa. Rounding off the storage are four right angled SATA ports and two straight angled SATA ports. The pair of straight angled ports are controlled by the ASMedia ASM1061 controller, while the four right angled take adage from the chipset itself. The SATA ports have support for RAID 0, 1 and 10.

On the rear panel, the AB350 Gaming K4 has a very similar layout to the competition with the main difference being the inclusion of a further two USB 3.1 Gen1 more than the Tomahawk. This gives the ASRock option a total of five USB 3.1 Gen1 Type-A ports, one USB 3.1 Type-C port, and a further two USB 2.0 included. A combo PS/2 keyboard and mouse port sits just below the USB 2.0, with a section dedicated to utilizing the new Raven Ridge APUs onboard graphic capabilities thanks to a D-sub, HDMI and DVI-D slot being featured; the VGA is controlled by the Realtek RTD2168. The single LAN port is controlled by the Realtek RTL8111GR with the three 3.5mm audio inputs from the Realtek ALC892 codec. There is a distinct lack of USB 3.1 Gen2 ports anywhere on the board, despite the chipset support, but this purely comes down to cost.

In the Box

The ASRock AB350 Gaming K4 has a relatively basic set of accessories, but from a logical stand point, it's to be expected given the low cost overall.

We get the following:

  • Driver Disk
  • UEFI BIOS & Quick Start guide
  • Rear I/O Plate
  • Two SATA 6 Gbps Cables (One right angled and one straight)
  • Two Installation screws for M.2 drives

ASRock AB350 Gaming K4 Overview And Overclocking BIOS And Software
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  • coder543 - Monday, April 9, 2018 - link

    Isn't it strange to have a whole series of reviews planned for this generation of AMD motherboards right now? A new motherboard (and processor) generation is expected to launch within the next 2 to 3 weeks. This ASRock AB350 should be forwards compatible (with a BIOS update), but wouldn't people buying a new motherboard be better off buying one with a newer chipset from the upcoming generation?

    But, according to the first page of this article, there are four other motherboards from this same generation with reviews in the works. Just something I find interesting.
  • The_Assimilator - Monday, April 9, 2018 - link

    Welcome to AnandTech anno 2018 - so perpetually late with certain reviews that it's often a wonder they bother putting them up. I guess Purch, "The Future of Digital Publishing", can't afford to hire more writers (because they sure as hell can't afford editors worth a damn, as shown by the ever-increasing amount of basic grammar and spelling mistakes in the articles that do get put up).

    I mean, it's certainly not like Purch bought AnandTech so that they can bleed it dry, then dump it once not even its name is worth anything. Nope. Not at all.
  • DigitalFreak - Monday, April 9, 2018 - link

    I really miss Anand.
  • close - Tuesday, April 10, 2018 - link

    These days the only 2 reasons to come here are if you still have some sort of muscle memory (like going to the fridge even if you don't want anything), or pure mistake - you actually wanted ArsTechnica or something like that.
  • Dr. Swag - Wednesday, April 11, 2018 - link

    ArsTechnica over Anandtech? Is that a joke? The only thing they win in is timeliness. In everything else, especially CPU and smartphone reviews, Anandtech is WAY more thorough, especially on the benchmark side of things.
  • NesteaZen - Wednesday, April 11, 2018 - link

    Oh? He sold the website? I'm not an uber active anandtech reader
  • Dr. Swag - Wednesday, April 11, 2018 - link

    He sold it to Purch in 2014
  • Lolimaster - Monday, April 9, 2018 - link

    They make a intel propaganda site, that's the goal.
  • Ryan Smith - Tuesday, April 10, 2018 - link

    If you see any errors or typos, please by all means let us know.

    Time is fleeting and Google cares more about who's first than who's best, so while I always strive to keep quality high, we do have to move quickly to stay relevant.
  • SlyNine - Tuesday, April 10, 2018 - link

    "A mid-range GPU, no overclock, a discrete graphics card"

    Not sure if this is an error or not. But it seems a tad redundant to mention GPU and discrete graphics card.

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