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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  • Topweasel - Monday, April 9, 2018 - link

    This isn't one of those "Delay'ed reviews". It's practically already in a retirement home. It's well over a year since this chipset launched. I was wondering since there had been a decent amount of Z370 and X299 reviews, I was left wondering where the AMD board reviews are, but not this, I mean we are less than a week for a new chipset on the platform with new CPU's, specially for such a milquetoast selection. Reply
  • IBM760XL - Monday, April 9, 2018 - link

    It's worth noting in the specs box on page two that there are the additional two SATA ports mentioned elsewhere above the base B350. That's one of the main reasons I'm considering this board.

    Although at this point, I'm going to wait for the next-gen to launch next week.
    Reply
  • npz - Monday, April 9, 2018 - link

    I guess it's alright. Just another in a sea of premium low-end chipset boards.

    The dual m.2 would've been a great differentiator but in reality the dual m.2 is pretty gimmicky. If the top m.2 shares lanes with the pcie x4 slot at the bottom that means it's mutially exclusive and using one disables the other. Likewise with what's mentioned in the article about the bottom m.2 slot sharing lanes with SATA. You end up disabling SATA ports because of that. I suppose real dual m.2 would require an expensive pcie switch which wouldn't make sense on this board.

    It's also too bad they cheapened out on the USB 3.1 that the chipset provides
    Reply
  • DanNeely - Tuesday, April 10, 2018 - link

    Some degree of lane sharing between PCIE slots and sata ports with m.2 ports is happening on almost all current gen full ATX boards for both AMD and Intel because (excluding threadripper with only 2 16x slots instead of the more common 3) there aren't enough total PCIe lanes available and for SATA it's cheaper to share between a port and m.2 slot than to make 2 variants of each board one wired the first way and the other the second even ignoring that both of those boards would fall one step behind in feature counts and ignores people who'd like to keep both options open to either connect an additional HDD or sata m.2 at some point in the future if they unexpectedly needed to. Reply
  • DanNeely - Tuesday, April 10, 2018 - link

    PCIe switches have been gone on anything but the most expensive boards for several years now. The only company making them was bought up by someone who decided there was more money to be made raising the price for an x8 to x16 from $40 to $100 to soak server vendors at the cost of almost completely abandoning the enthusiast consumer market as a result. Reply
  • notashill - Wednesday, April 11, 2018 - link

    I think anyone who actually needs to use more than two m.2 drives and three hard drives simultaneously can afford an X370 board. Reply
  • Death666Angel - Wednesday, April 18, 2018 - link

    The problem is that the mATX variant of this board, the ASRock AB350M Pro4, is the only mATX AM4 motherboard I could find with two M.2 slots. All other B350 and X370 mATX boards only have one M.2 slot. The X399M Taichi TR4 mATX board has 3 M.2 slots, so it is possible to get more. I don't mind the second port being SATA too much, since there aren't too many PCIe lanes to go around. Although a PCIe Gen 2 M.2 slot would have added a bit of performance. But that would definitely be a niche market. For peole wondering why I would need such a configuration: it's mostly to reduce clutter inside my case. Gum stick SSDs are much neater than 2.5" ones with their cables. Reply
  • dromoxen - Wednesday, April 11, 2018 - link

    both major players offer non-overclockable mid-range CPUs?? i WAS under the impression that ALL ryzens were o/c able .. Not all mid range chipsex offer overclocking tho ab320 Reply
  • hammerang - Wednesday, April 11, 2018 - link

    Sorry but shouln't a proper gaming motherboard test include mobo components thermal data with and without OC? Reply
  • hammerang - Wednesday, April 11, 2018 - link

    Regarding the ALC892, i so budget i gonna buy an additional pcie sound card for another $80. Reply

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