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Best B550 Motherboards 2021: AMD’s More Affordable PCIe 4.0 Option

AMD B550 Motherboards
(Image credit: AMD)

The Best B550 motherboard for your next AMD build might not be a B550 board at all. AMD’s B550 chipset arrived with anticipation of PCIe 4.0 support at low prices, given the high cost of most X570 boards and the appealingly low price of many previous-generation B450 motherboards. But now that we’re a year out from the launch of B550, we know that AMD’s more mainstream AM4 platform delivers on at least one of those promises--PCIe 4.0.

While there’s less bandwidth for multiple next-generation high-speed storage and graphics card setups with B550, it does deliver enough PCIe 4.0 lanes for the typical setup of a single speedy boot drive and graphics card. And overall, B550 prices are lower than their X570 counterparts. But many B550 motherboards --  particularly the high-end models -- surpass the price of many older, lower-end X570 motherboards. 

So even the best B550 motherboards may not have as broad appeal as cheaper B450 options -- especially as many of those last-gen boards are still on the market. Also consider that A520 motherboards start at around $60, though you’ll forego PCIe 4.0 with these lower-priced boards, which is a key selling point of AMD’s latest platforms, as well as now Intel with Z590/Rocket Lake.

There are other considerations (and complications) if you’re choosing the best B550 motherboard, as well.  Those who like their PCs to run silently will appreciate that the B550 chipset doesn’t require support for active cooling. But note that a refreshed X570S chipset/motherboard launch seems imminent, which does away with the fan issue, while also delivering the extra bandwidth of AMD's flagship chipset.

The key thing to note with B550 is that, while the chipset supports current and future Zen 3 processors, the boards didn’t support Ryzen 2000 and earlier processors, or Ryzen 3000 APUs like the Ryzen 5 3400G--at least at launch. While the AM4 socket remains the same, ROM size limitations make it impossible for board makers to include support for all current, future, and past Ryzen processors with a single firmware package.

So if you have an older Ryzen 2000 CPU or Ryzen 3000 APU, be sure to double-check the board’s product page to see if it’s compatible with your processor. At the very least, you may need to update the board’s BIOS to support a given chip. And depending on the features of a given board, that may be impossible to do without also having a different CPU that works with the board out of the box. You don’t want to spend tons of time researching the best B550 motherboard for your build, only to find out after you buy it that it won’t boot with your existing CPU.

AMD B550 Chipset: PCIe 4.0 for the Rest of Us

With all that out of the way, what exactly does B550 offer? Here’s how AMD sees it:

(Image credit: AMD)

In short, you get PCIe 4.0 support through the CPU, delivering enough lanes for a fast NVMe PCIe 4.0 SSD and the GPU. Also included is dual-GPU support (though that’s a feature with far less appeal in recent years for gamers), along with a doubling of the bandwidth of the motherboard’s general-purpose PCIe lanes from the chipset, from 2.0 to 3.0. That increased per-lane throughput allowed AMD to reduce the number of lanes between the chipset and CPU from six PCIe 2.0 lanes to four PCIe 3.0.  

CPU Graphics SupportX16 PCIe Gen 3X16 PCIe Gen 4X16 PCIe Gen 4
CPU Storage SupportPCIe Gen 3PCIe Gen 4PCIe Gen 4
CPU USB PortsUSB 3.1 Gen 1USB 3.1 Gen 2USB 3.1 Gen 2
Dual Graphics SupportNoYesYes
General Purpose LanesPCIe Gen 2PCIe Gen 3PCIe Gen 4
CPU Chipset UplinkPCIe Gen 3PCIe Gen 3PCIe Gen 4
Overclocking SupportYesYesYes

Below are our tested picks for the best B550 motherboards, at various price points and form factors. We expect this list to grow once we test more of these mainstream AMD motherboards.

Best B550 Motherboard: Asus ROG Strix B550-F Gaming Wi-Fi (Image credit: Asus)

1. Asus ROG Strix B550-F Gaming Wi-Fi

Best B550 Motherboard

Socket: AM4 | Chipset: AMD B550 | Form Factor: ATX | Voltage Regulator: 12+2 phases | PCIe x16: (1) v4.0 (x16), (1) v3.0 (x4) | USB Ports: (2) USB 3.2 Gen 2 (10 Gbps), (4) USB 3.2 Gen 1 (5 Gbps), (2) USB 2.0 | Warranty: 3 years

Capable 14-Phase Power Delivery
2.5 GbE LAN and Wi-Fi 6 AX200
Premium Audio
More than $200 still seems expensive for B550

Asus’ ROG Strix B550-F Gaming Wi-Fi delivers premium features including SupremeFX Audio, Intel Wi-Fi 6 AX200, solid power delivery and more. It’s a good option around the $200 mark, though if you don’t need Wi-Fi capability, the non-Wi-Fi version of the same board costs $30 less with the same specifications, making it easy to recommend if you plan on using Ethernet or have your own wireless card.

Read: Asus ROG Strix B550-F Gaming Wi-Fi review

NZXT N7 B550 (Image credit: Tom's Hardware)

2. NZXT N7 B550

Best B550 Motherboard (Alternate)

Socket: AM4 | Chipset: AMD B550 | Form Factor: ATX | Voltage Regulator: 12+2+2 phases | PCIe x16: (1) v4.0 (x16), (1) v3.0 (x4) | USB Ports: (1) USB 3.2 Gen 2 Type-C (10 Gbps), (3) USB 3.2 Gen 2 Type-A (5 Gbps), (4) USB 3.2 Gen 1, Type-A (5 Gbps), (2) USB 2.0 | Warranty: 3 years

Capable Power Delivery
Wi-Fi 6E and 2.5 GbE
10 USB ports
Lack of integrated RGBs may be a turnoff
No USB 3.2 Gen2x2 (20 Gbps) ports

NZXT’s first foray into AMD motherboards is a success. Coming in late to the game allowed the company to implement feedback from its Intel boards, adding more USB ports to the rear IO. The additional time also allowed NZXT to implement cutting-edge Wi-Fi 6E as well, alongside 2.5GbE. Outside of that, the appearance changed significantly from the company’s previous boards, with shrouds dominating the surface and an absence of on-board RGBs.

With an MSRP of $229, the NZXT N7 B550 costs about $15 more than our primary pick, but delivers a newer Wi-Fi chip, more and faster USB ports, and solid performance in a package that's visually distinct from all other B550 competition. If you can spend this much and don't need the extra PCI 4.0 bandwidth that comes with similarly priced older X570 motherboards, the NZXT N7 B550 is well worth considering.

Read: NZXT N7 B550 review 

Best B550 Motherboard (if Price Is No Object): Gigabyte B550 Aorus Master (Image credit: Gigabyte)

3. Gigabyte B550 Aorus Master

Best B550 Motherboard (if Price Is No Object)

Socket: AM4 | Chipset: AMD B550 | Form Factor: ATX | Voltage Regulator: 16 phases | PCIe x16: (1) v4.0 PCIe x16; (2) v3.0 (x4) | USB Ports: (1) USB 3.2 Gen 2, Type-C (10 Gbps), (4) USB 3.2 Gen 2, Type-A (10 Gbps), (1) USB 3.2 Gen 2, Type-A (5 Gbps), (6) USB 2.0, Type-A | Warranty: 3 years

Solid 16-Phase 70A Power Delivery
Three M.2 slots, all with heatsinks
2.5 GbE LAN/Wi-Fi 6 AX200
Price is well into X570 territory

There are plenty of cheaper B550 based options than the Gigabyte B550 Aorus Master, but if you’re looking at flagship mainstream parts, you likely already know that you are set with a single GPU and PCIe 4.0 M.2 module. While you can add more modules, you’ll be limited to PCIe 3.0 (still plenty fast enough for many) with those extra drives. If you’re still a heavy SATA-based storage user and six of those ports isn’t enough, look to the the ASRock B550 Taichi. But if you need three M.2 slots and loads of USB, the Aorus Master delivers.

The B550 Aorus Master is a very capable board, loaded up with premium features like Wi-Fi 6 and high-quality VRMs. It’s one of the more well-appointed B550 motherboards, though that also means it’s expensive. If a $250+ B550-based motherboard is what you’re looking for, the B550 Aorus Master should be on your short list.

Read: Gigabyte B550 Aorus Master review

Best Mid-Range B550 Motherboard: MSI MAG B550 Tomahawk (Image credit: MSI)

4. MSI MAG B550 Tomahawk

Best Mid-Range B550 Motherboard

Socket: AM4 | Chipset: AMD B550 | Form Factor: ATX | Voltage Regulator: 13 phases | PCIe x16: (1) v4.0 PCIe x16; (1) v3.0 (x4) | USB Ports: (2) USB 3.2 Gen 2, Type-A and Type-C (10 Gbps), (2) USB 3.2 Gen 1, Type-A (5 Gbps), (2) USB 2.0, Type-A | Warranty: 3 years

Capable 13-Phase 60A Power Delivery
Dual Ethernet (1/2.5 GbE)
High-power fan/pump headers
Only six USB ports on Rear IO
Other boards have better audio codec
No integrated Wi-Fi

MSI’s MAG B550 Tomahawk delivers a well-balanced feature set at a competitive price. Performance is up there with the more expensive boards, and the VRMs held their own even when overclocked. At $180, you’ll have to live without Wi-Fi, and some potential drawbacks are the six total USB count on the rear IO as well as the lesser audio codec compared to many other boards. Assuming these are not deal breakers for your build, the MSI B550 MAG Tomahawk deserves consideration if your budget is around the $180 mark.

Read: MSI MAG B550 Tomahawk review

Best Mini ITX B550 Motherboard: Asus ROG Strix B550-I Gaming (Image credit: Tom's Hardware)

5. Asus ROG Strix B550-I Gaming

Best Mini ITX B550 Motherboard

Socket: AM4 | Chipset: AMD B550 | Form Factor: Mini ITX | Voltage Regulator: 10 phases | PCIe x16: (1) v4.0 | USB Ports: (4) USB 3.2 Gen 2 (1 Type-C), (2) USB 2.0 (1 Type-C) | Warranty: 3 years

Two M.2 slots
Active VRM cooling
Wi-Fi 6 and 2.5Gb Ethernet
Only six USB ports, one of which is for audio

If you’re after a B550 board in the compact Mini ITX form factor, you only have a handful of choices, but Asus’ ROG Strix B550-I Gaming stands out. At $230, it’s on the pricier end, but $100 less than Gigabyte’s B550I Aorus Pro AX, while still delivering two M.2 slots (one around back), Wi-Fi 6 and 2.5Gb Ethernet. And active VRM cooling means you shouldn’t have to deal with the heat issues we saw with the Asus Prime B550M-A Wi-Fi and our 3900X.

You’ll have to live with just six USB ports on the rear IO, but that’s par for the course with these small B550 boards. Just note that one of the six ports is a USB 2.0 Type-C port designed for audio. If you’re planning on building with an APU, you get a trio of video ports, and the analog audio jacks light up. That’s the extent of on-board RGB, though. If you want more lighting, you’ll have to provide that with other components and accessories.

You’ll also have to deal with some inconveniently placed headers, like the front-panel audio pins which are wedged between the primary M.2 heatsink and the two RAM slots. But again, this is to be expected when lots of high-end features get jammed onto such a small board. For about $30 less, you can pick up MSI’s MPG B550I Gaming Edge Wi-Fi. That board is similar in many ways, but trades a couple video ports for a PS/2 port and more audio jacks. It also has fewer USB 3.2 Gen2 ports, although it does have more Type-A ports than Asus’ ITX board.

Savings on the Best B550 Motherboards

Whether you're buying one of the best B550 motherboards or a different model, you may find some savings by checking our list of coupon codes, especially our list of Newegg promo codes and Micro Center coupons.

  • dennphill
    Admin said:
    We’ve tested several AMD models to find the best B550 motherboard for your PC build needs.

    Best B550 Motherboards: AMD’s More Affordable PCIe 4.0 Option : Read more
    I don't see how these are 'more affordable' - looks like the same priccing announced innitially. Specs are the same. AND I DON'T see anything compelling in an mATX format for the B550.
  • jpe1701
    The b550 aorus master has 3 pcie 4.0 m.2 slots. It steals 8 lanes from the primary x16 slot and splits them between the bottom 2 m.2. it is a weird setup. You actually get all of the lanes directly from the CPU so storage nuts should love it, but gamers probably won't like there gpu at x8 if they use those slots. This is pretty important stuff and should be listed.
  • dennphill
    I've not been to Tom's in a while - particularly POed they refuse to even consider or comment on mATX form factor sized products - it's like ya' gotta' git a giant tower!...or read their reviewers' anguish over all they can't fit anything else in an ITX MB. For the record, to go with my new 5600X (which I scored a few weeks ago from B&H for list price (!)) I just received an ASUS TUF Gaming B550M-Plus. Now all I have to do is wait a year or two more to get something to upgrade my old MSI GTX 1660 Ventus that I bought 2 years ago from NewEgg for just over $220 (BTW, it is now going for $684 according to NewEgg's site yesterday - 30 Mar 2021 - and $749 on Amazon today...and that is not for the 15660 Super, just the vanilla 6GB 1660!). What a lousy situation. Truly disgusting.