Does it work with Ryzen 5000 CPUs out of the box?

Usually, but not always. Older stock may ship with a BIOS that predates Zen 3 support, so a BIOS update can be required before a Ryzen 5000 chip boots.

Does it support PCIe 4.0?

Yes. The B550 chipset routes PCIe 4.0 lanes from the CPU to the graphics slot and one M.2 slot, provided you use a Ryzen 3000 or 5000 CPU.

No. There is no onboard wireless, so you need an Ethernet cable or a separate Wi-Fi card or USB adapter.

How much memory can it take?

Four DDR4 DIMM slots, with overclocking support listed well above 4000 MHz depending on the CPU and kit.

Is it good for overclocking?

Only lightly. The VRM and heatsinks are modest, so it suits mild overclocks on mid-range chips rather than pushing high-core CPUs.

What form factor cases does it fit?

It is micro ATX, so it fits micro ATX and standard ATX cases; many small-form-factor cases will not take it.

ASRock B550M Phantom Gaming 4 AM4 AMD B550 Micro ATX AMD Motherboard

Best price now

$79.99at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

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ASRock B550M Phantom Gaming 4 AM4 AMD B550 Micro ATX AMD Motherboard

Best price now

$79.99at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $79.99 at Walmart on Nov 10.

Our take on the ASRock B550M Phantom Gaming 4 AM4 AMD B550 Micro ATX AMD Motherboard

The ASRock B550M Phantom Gaming 4 is a micro ATX motherboard for AMD's AM4 socket, built on the B550 chipset. It supports Ryzen 3000 and 5000 series chips (Zen 3 may need a BIOS update) and takes up to four DDR4 DIMMs with memory overclocking well past 4000 MHz on paper. It is a budget-minded board: you get PCIe 4.0 from the CPU, M.2 storage, and basic RGB headers, but fewer USB ports and a lighter VRM than pricier B550 boards. It suits a compact, value-focused gaming build where you don't need Wi-Fi or heavy overclocking headroom.

Best forBudget micro ATX gaming buildsRyzen 5000 builds on a tight budgetSmall-form-factor cases that take micro ATXFirst-time builders who want the basics

Pros

B550 chipset gives PCIe 4.0 to the graphics card and an M.2 slot
Four DIMM slots with high memory overclocking support
Micro ATX size fits compact cases
Addressable and standard RGB headers for lighting
Simple layout that is easy to build on

Cons

No built-in Wi-Fi or Bluetooth
Modest VRM and heatsinks limit heavy overclocking
Fewer USB ports than full-size B550 boards
Zen 3 CPUs may need a BIOS update before booting
No USB-C header on the board

ASRock B550M Phantom Gaming 4 AM4 AMD B550 Micro ATX AMD Motherboard prices at every store

WalmartNew
In stockSold by Newegg Inc.Returns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$79.99Free shippingChecked Nov 10
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What reviewers say

Owners and reviewers treat it as a solid entry-level B550 board that does the basics well for the money. Praise centers on the easy build, PCIe 4.0 support and stable memory speeds; criticism lands on the thin feature set, limited USB and the need to check BIOS support for newer Ryzen chips.

What people mention

ValuePraisedBuyers say it covers the essentials for a budget build without paying for extras they don't need.
Build setupPraisedOwners describe the layout as straightforward and quick to assemble.
ConnectivityCriticisedReviewers note the limited USB port count and the lack of onboard Wi-Fi.
VRMMixedIt handles mid-range Ryzen chips fine, but owners warn against pairing it with power-hungry high-end CPUs.
BIOS supportMixedSome buyers had to update the BIOS before a Ryzen 5000 chip would boot.

About the ASRock B550M Phantom Gaming 4 AM4 AMD B550 Micro ATX AMD Motherboard

The ASRock B550M Phantom Gaming 4 is a Micro ATX motherboard with an AM4 socket and the AMD B550 chipset. It supports 3rd Gen AMD AM4 Ryzen processors and future AMD Ryzen processors. It is not compatible with the AMD Ryzen 5 3400G or the Ryzen 3 3200G.

A BIOS update might be required for AMD Zen 3 Ryzen 5000 series CPUs. ASRock's website has the CPU support list.

The board takes ECC and non-ECC un-buffered DDR4 memory. Ryzen (Matisse) CPUs support speeds from DDR4 2133 up to 4533+ with overclocking. Ryzen (Renoir) APUs support speeds from DDR4 2133 up to 4733+ with overclocking.

Form factor: Micro ATX
Socket: AM4
Chipset: AMD B550
CPU support: 3rd Gen AMD AM4 Ryzen and future AMD Ryzen processors; not compatible with Ryzen 5 3400G or Ryzen 3 3200G
Ryzen 5000: May require a BIOS update
Memory type: DDR4, ECC and non-ECC, un-buffered
Memory (Matisse): 2133, 2400, 2667, 2933, 3200; up to 4533+ with overclocking
Memory (Renoir): 2133, 2400, 2667, 2933, 3200; up to 4733+ with overclocking
Storage: SATA 6Gb/s
Color: Multicolor

Specifications

color: MulticolorSource
size: Micro ATXSource

Questions and answers

Does it work with Ryzen 5000 CPUs out of the box?: Usually, but not always. Older stock may ship with a BIOS that predates Zen 3 support, so a BIOS update can be required before a Ryzen 5000 chip boots.
Does it support PCIe 4.0?: Yes. The B550 chipset routes PCIe 4.0 lanes from the CPU to the graphics slot and one M.2 slot, provided you use a Ryzen 3000 or 5000 CPU.
Does it have Wi-Fi?: No. There is no onboard wireless, so you need an Ethernet cable or a separate Wi-Fi card or USB adapter.
How much memory can it take?: Four DDR4 DIMM slots, with overclocking support listed well above 4000 MHz depending on the CPU and kit.
Is it good for overclocking?: Only lightly. The VRM and heatsinks are modest, so it suits mild overclocks on mid-range chips rather than pushing high-core CPUs.
What form factor cases does it fit?: It is micro ATX, so it fits micro ATX and standard ATX cases; many small-form-factor cases will not take it.
Where is the ASRock B550M Phantom Gaming 4 AM4 AMD B550 Micro ATX AMD Motherboard cheapest?: At Walmart, for $79.99, as of our latest check.