Description
What The ASRock AB350 PRO4 Is
The ASRock AB350 PRO4 is a full size ATX motherboard for AMD’s Socket AM4, built on the B350 chipset. It belongs to the first wave of AM4 boards, first listed in February 2017, and the specification reflects that era: DDR4 memory, PCIe 3.0, six SATA3 ports and an M.2 socket, with gigabit Ethernet and Realtek audio.
AM4 turned out to be an unusually long lived socket, which makes the processor support statement on this listing the most important thing on the page. It is also where the listing is most limited, so it is worth taking that first before anything else.
Processor Support, Read Carefully
ASRock states support for AMD Socket AM4 A-Series APUs on the Bristol Ridge architecture and Ryzen Series CPUs on Summit Ridge. Summit Ridge is the first generation of Ryzen desktop processors. Nothing on this listing mentions later Ryzen generations, and nothing mentions BIOS versions or BIOS updates.
That gap matters more here than on almost any other board in this catalog, because AM4 went on to carry several further processor generations and B350 board support for them depended entirely on manufacturer BIOS updates. Because this page names only Bristol Ridge and Summit Ridge, a buyer intending to fit a later Ryzen chip cannot conclude anything from this listing. The correct step is to check the ASRock support page for the AB350 PRO4, find the exact processor model on the CPU support list, and note which BIOS version it requires. Boards shipped years ago may carry an older BIOS, and updating a BIOS usually requires a processor the current BIOS already supports.
The listing does include one genuinely useful compatibility warning of its own. The operating system field states that Bristol Ridge and Summit Ridge do not officially support Windows 11. Anyone planning a Windows 11 machine on this board with one of those processors should treat that as a real constraint rather than a footnote.
Memory, Slots And Storage
Memory is four DDR4 DIMM slots supporting DDR4-2667, 2400 and 2133, running dual channel with both ECC and non ECC unbuffered modules accepted, to a maximum of 64GB. ECC support on a consumer board is unusual and useful for anyone building a home server or workstation where memory error correction matters.
The slot layout is generous. Two PCI Express 3.0 x16 slots are fitted, with the listing noting that one runs at x4, plus four PCI Express 2.0 x1 slots. Six slots in total gives real flexibility for add in cards, and the x4 second slot is well suited to a storage controller or a network card rather than a second graphics card. Storage is six SATA3 ports, four of which support RAID 0, 1 and 10, alongside an M.2 socket. Six SATA ports plus RAID makes this a practical base for a home storage machine, and it pairs sensibly with a case built for drives such as the JONSBO N2.
Audio is the Realtek ALC892 codec in a 7.1 channel arrangement, and the board also supports triple monitor output for processors with integrated graphics. Networking is gigabit Ethernet with no wireless described.
One further point about ECC support on this board. ECC memory detects and corrects single bit errors in transit, which matters for a machine holding data over long periods, such as a home file server. Consumer boards frequently do not accept ECC modules at all, so a listing that names both ECC and non ECC unbuffered support is worth noting. What the listing does not say is whether error correction is actually active or whether the modules simply run without it, which depends on the processor and the BIOS.
Highlights
- Socket AM4 with the AMD B350 chipset.
- Full ATX form factor.
- Four DDR4 slots at 2667, 2400 and 2133.
- ECC and non ECC unbuffered memory accepted, up to 64GB.
- Two PCIe 3.0 x16 slots, one running at x4.
- Four PCIe 2.0 x1 slots.
- Six SATA3 ports with RAID 0, 1 and 10 on four of them.
- M.2 storage socket.
- Realtek ALC892 7.1 channel audio.
- Triple monitor support with an integrated graphics processor.
Things To Consider
The specification table lists memory speed as 2400 MHz while the feature bullets list DDR4-2667, 2400 and 2133, so the two do not agree on the top supported speed. Item weight is given as 2.8 pounds and dimensions as 13.1 by 10.4 by 2.4 inches, which describe the retail box rather than a 12 by 9.6 inch ATX board. The number of USB 2.0 ports is listed as 2 with no other USB counts given anywhere, so the rear panel layout cannot be determined from this page.
- Only Bristol Ridge and Summit Ridge processors are named. Later Ryzen generations are not addressed.
- No BIOS version or update requirement is stated, which is the key unknown on an early AM4 board.
- The listing itself notes that these processors do not officially support Windows 11.
- PCIe 3.0 only, and the second x16 slot runs at x4.
- No onboard wireless.
- The M.2 socket count and its interface are not detailed.
- Memory speed is listed two different ways.
- USB port counts and rear panel layout are not published.
Who Should Buy It And Who Should Not
The AB350 PRO4 makes sense as a repair or rebuild board for an existing AM4 system, particularly one built around a first generation Ryzen chip, and as a base for a home storage or workstation build that benefits from six SATA ports, ECC memory support and six expansion slots. Those are genuinely useful attributes and they are why boards like this stay in service long after their launch generation.
It is the wrong board for anyone buying a new processor without first checking the CPU support list and BIOS requirement, and the wrong board for a Windows 11 build with the processors the listing names. Builders wanting a current AMD platform should look at a processor such as the Ryzen 5 7600X and a matching board, while those staying on AM4 can compare the ASRock B550M Steel Legend, the MSI A520M-A PRO and the compact ASRock A520M-ITX/AC. The full motherboards category and the CPU processors category cover both sides of the decision.
