OVERALL
ALTERNATIVES
SPECS
VS AVERAGE
REVIEWS
Scored using Motherboards Methodology v3.0
Motherboards Methodology v3.0
Mathematical & Unbiased Scoring
Products in this category are scored under Frontum Motherboards Methodology v3.0: the technical score from the specifications is the base, and independent expert and video reviews (up to ±0.5 points), owner opinions (up to ±0.3) and best-of lists (up to +0.3) move it up or down.
Explore Motherboards Methodology v3.0

ASUS Prime B550M-K review: 109 specs compared

Avg. price:~£80CPU socket:AM4Chipset:AMD B550Form factor:microATX

ASUS Prime B550M-K Review: Compare 109 technical specifications and 2 expert and video reviews to see how this product ranks in the Motherboards category and whether it is worth buying.

ASUS Prime B550M-K
6.1/10

Overall score

Score
6.1/ 10
✕
What it is
Our main score for this model, 1–10. It combines specs, expert reviews, best-of lists, owners and ratings from across the web.
How we count it
Parts: Technical score 40%, Reviews score 20%, List score 20%, Sentiment score 10%, User score 10%
Marks: Each part gets a mark out of 10. For reviews, lists and owners, a typical model in this category gets about 8 and the best one gets 10.
No data yet: A part with no data shows "?". It counts as the mark of a weaker model in this category (4 in 5 models with data score higher). This way, models with reviews, lists and owners usually come out ahead.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 82% of models
Score components

40%

5.3

Technical score

20%

5.3

Reviews score

20%

?

List scoreNot enough data yet, so we use 7.5, the mark of a weaker model in this category

10%

5.3

Sentiment score

10%

9.0

User score

â–¼Worse than 82% of motherboards
7.3

Value for money

Value for money
7.3/ 10
✕
What it is
An indicator that combines the motherboard's overall rating with its cost.
When it matters
When you are looking for a motherboard that offers a strong balance of features, performance, and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 79% of models
Score components

70%

6.1

Overall score

30%

10

Price

â–¼Worse than 79%
5.3

Technical score

Technical score
5.3/ 10
✕
What it is
How good the specs are compared with the other models in this category, 1–10.
How we count it
Areas: We rate the specs in each area against the other models in this category.
Weighting: The areas that matter most to buyers count more. The shares are shown under Score components.
Share: The technical score is 40% of the overall score.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 67% of models
Score components

19%

7.1

Memory

16%

7.5

Platform

16%

5.4

Storage

15%

2.9

Network

13%

2.8

Ports

8%

4.2

Expansion

8%

5.4

Power & Cooling

5%

6.5

Audio

â–¼Worse than 67%
5.3

Reviews score

Reviews score
5.3/ 10
✕
What it is
Average grade from independent test sites, magazines and video reviewers, 1–10.
How we count it
Grades: Each review's own score is converted to 1–10; without one, we grade the review ourselves. Big test sites count more, short reviews half as much as full tests. A video review counts half.
Score: The average grade is 80% of the review mark; the number of reviews is the other 20% (1 review = 5, the typical number in this category = 8, the most-reviewed model = 10).
Enough data: With few reviews, the average grade is pulled toward the typical grade of this category. No reviews yet: 7.8 for now.
Share: Reviews count 20% of the overall score.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 84% of models

5.3

Mark 7.6 is below the typical mark 8.3 of this category, so it cannot lift the score above the technical score

80%

7.8

Average grade

20%

6.9

Popularity

Grades by review (2)
2 video reviews, each counting half as much as a written test. Reviews count 20% of the overall score.
Ratings from across the web count in the User score, not in this score.
â–¼Worse than 84%
9.0

User score

User score
9.0/ 10
✕
What it is
How happy buyers are with this model, based on ratings from across the web.
How we count it
Enough data: A model needs at least 1 rating from across the web. Without one, it counts as 7.9, the mark of a weaker rated model in this category.
Share: User score counts 10% of the overall score.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 79% of models

70%

8.6

Rating

30%

10

Popularity

â–²Better than 79%
?

List score

List score
7.5/ 10
✕
What it is
How often independent test sites, magazines and video reviewers put this model in their best-of lists for this category.
How we count it
Points: The model in the most lists of this category gets 10; the others get 8 to 10 in proportion. In no list yet: 7.5. Lists count 20% of the overall score.
Enough data: Every list counts, even a single one. With fewer than 5 best-of lists in the category, this part is left out.
Lists with this model (0)
Not in any best-of list yet, so this part counts as 7.5. Models in a list get 8 to 10.
Not in any best-of list yet
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Where to buy
*As an Amazon Associate, we earn from qualifying purchases.
Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.

What owners say about the ASUS Prime B550M-K

Based on 47 owners sharing their experience in online comments

32%positive2%mixed66%negative

Owners value broad Ryzen compatibility and gaming performance, but boot, display, BIOS, and RAM problems are frequent.

What owners dislike

  • Some owners see black screens, freezes or no display after a BIOS update or a CPU swap, especially with a Ryzen 5600X.10
  • Some owners report that only two of four RAM slots work, or that memory runs at a lower speed than its rated 3600MHz.6
  • Owners say the built-in Wi-Fi only links on 2.4 GHz, so 5 GHz networks are missing, and some find the board has no Wi-Fi or Bluetooth.4
  • Some owners report the PC restarts during games or when a game launches, with a Ryzen 5600X and an RTX 2060.3
  • Owners say the BIOS shows the PCIe slot as 3.0 instead of 4.0, so a 4.0 graphics card may not run at full speed.3
  • Owners report that updating the BIOS caused black screens or display loss, and that USB devices disconnect and reconnect on their own.3

Points mentioned by at least 3 owners, most mentioned first.

Loading category ranking...

Technical Specifications of motherboard ASUS Prime B550M-K

Technical score
Technical score
5.3/ 10
✕
What it is
How good the specs are compared with the other models in this category, 1–10.
How we count it
Areas: We rate the specs in each area against the other models in this category.
Weighting: The areas that matter most to buyers count more. The shares are shown under Score components.
Share: The technical score is 40% of the overall score.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 67% of models
Score components:

19%

7.1

Memory

16%

7.5

Platform

16%

5.4

Storage

15%

2.9

Network

13%

2.8

Ports

8%

4.2

Expansion

8%

5.4

Power & Cooling

5%

6.5

Audio

5.3
Reviews score
5.3
User score
9.0
List score
?
Value for money
Value for money
7.3/ 10
✕
What it is
An indicator that combines the motherboard's overall rating with its cost.
When it matters
When you are looking for a motherboard that offers a strong balance of features, performance, and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 79% of models
Score components:

70%

6.1

Overall score

30%

10

Price

7.3
CPU socket
AM4
This motherboard uses AM4, which is more up-to-date than 38.2% of Motherboards and the same as 13.3% of Motherboards.
CPU platform
AMD
Chipset
AMD B550
This motherboard uses AMD B550, which is more capable than 49.9% of Motherboards and as capable as 4.8% of Motherboards.
Form factor
microATX
Integrated graphics support
yes
This motherboard supports integrated graphics. 10.2% of motherboards support this feature.
Rear outputs: HDMI + DVI + VGA.
Show more
DDR memory version
DDR4
This motherboard uses DDR4, which is more modern than 13.4% of Motherboards and the same as 50.4% of Motherboards.
Memory slots
4
Market range: <2 – >4
This motherboard has 4 Memory slots, which is more than 21.9% of motherboards and equal to 72% of motherboards.
Maximum memory capacity
128 GB
Market range: <32 GB – >256 GB
This motherboard supports up to 128 GB of memory, which is more than 40.1% of motherboards and equal to 31.9% of motherboards.
Memory channels
2
Maximum RAM speed
5,100 MT/s
Market range: <2.1k MT/s – >8k MT/s
This motherboard supports memory speeds up to 5,100 MT/s, which is higher than that of 59.6% of motherboards and equal to that of 1% of motherboards.
Show more
N. of M.2 sockets
2
Market range: <0 – >4
This motherboard has 2 M.2 sockets, which is more than 30.5% of motherboards and equal to 34.5% of motherboards.
M.2 slot interface per slot
1x PCIe 4.0 x4/SATA, 1x PCIe 3.0 x4/SATA
This motherboard offers M.2 slots: 1x PCIe 4.0x4/SATA, 1x PCIe 3.0x4/SATA, which is slower than 51% of Motherboards and the same as 1.3% of Motherboards.
N. of SATA 3 connectors
4
Market range: <4 – >8
This motherboard has 4 SATA 3 connectors, which is more than 6.1% of motherboards and equal to 46.8% of motherboards.
Supported RAID levels
0/1/10
This motherboard RAID support: 0/1/10, which is less flexible than 67.6% of Motherboards and the same as 23.6% of Motherboards.
NVMe RAID support
yes
This motherboard supports NVMe RAID. 40.2% of motherboards support this feature.
Show more
N. of PCIe 5.0 x16 slots
0
Market range: <0 – >1
This motherboard has 0 PCIe 5.0x16 slots, which is fewer than 31.6% of motherboards and equal to 68.4% of motherboards.
N. of PCIe 4.0 x16 slots
1
Market range: <0 – >1
This motherboard has 1 PCIe 4.0x16 slots, which is more than 55.2% of motherboards and equal to 35.7% of motherboards.
N. of PCIe 3.0 x16 slots
0
Market range: <0 – >3
This motherboard has 0 PCIe 3.0x16 slots, which is fewer than 59.6% of motherboards and equal to 40.4% of motherboards.
runs at x1 mode
PCIe slot electrical configuration
x16/x1/x1
This motherboard splits its PCIe lanes as x16/x1/x1, which is less generous than 59% of Motherboards and the same as 5.6% of Motherboards.
PCIe bifurcation support
yes
This motherboard supports PCIe bifurcation. 40.3% of motherboards support this feature.
x8/x8.
Show more
Total USB ports (rear I/O)
6
Market range: <6 – >10
This motherboard has 6 USB ports (rear I/O), which is fewer than 63.8% of motherboards and equal to 32.8% of motherboards.
Total USB ports (including headers)
12
Market range: <11 – >19
This motherboard has 12 USB ports (including headers), which is fewer than 72.4% of motherboards and equal to 16.2% of motherboards.
Total USB-C ports (rear I/O)
0
Market range: <0 – >2
This motherboard has 0 USB-C ports (rear I/O), which is fewer than 64.2% of motherboards and equal to 35.8% of motherboards.
Total USB-C ports (including headers)
0
Market range: <0 – >3
This motherboard has 0 USB-C ports (including headers), which is fewer than 69.5% of motherboards and equal to 30.5% of motherboards.
N. of USB 3.2 Gen2x2 ports (USB-C)
0
Market range: <0 – >1
This motherboard has 0 USB 3.2 Gen2x2 ports (USB-C), which is fewer than 18% of motherboards and equal to 82% of motherboards.
Show more
LAN speed
1 Gbps
Market range: <1 Gbps – >2.5 Gbps
This motherboard supports LAN speeds up to 1 Gbps, which is lower than that of 51.1% of motherboards and equal to that of 48.9% of motherboards.
LAN controller
Killer + Intel + Realtek
This motherboard has a Killer + Intel + Realtek LAN controller, which is slower than 64.6% of Motherboards and equal to 28.7% of Motherboards.
N. of RJ45 ports
1
Market range: <1 – >2
This motherboard has 1 RJ45 ports, which is fewer than 14.4% of motherboards and equal to 85.6% of motherboards.
Wi-Fi connectivity
no
This motherboard does not support Wi-Fi connectivity. 50.1% of motherboards support this feature.
Wi-Fi version
N/A
Show more
Audio codec
Realtek ALC887/897
This motherboard uses Realtek ALC887/897, which is lower-end than 97.3% of Motherboards and the same as 0.5% of Motherboards.
Audio channels
7.1
This motherboard offers 7.1 audio channels, which is more than 4.7% of motherboards and equal to 95.3% of motherboards.
full 7.1 needs front panel audio.
Audio SNR
97 dB
Market range: <95 dB – >120 dB
This motherboard has an audio SNR of 97 dB, which is lower than that of 65.7% of motherboards and equal to that of 16.9% of motherboards.
Headphone amp support
yes
This motherboard supports a headphone amp. 41.2% of motherboards support this feature.
N. of 3.5mm audio jacks
3
Market range: <2 – >6
This motherboard has 3 3.5mm audio jacks, which is more than 11.3% of motherboards and equal to 39.3% of motherboards.
Show more
VRM phases
4+2
This motherboard has 4+2 VRM phases, which is fewer than 88.4% of motherboards and equal to 5.4% of motherboards.
N. of CPU power connectors
1
Market range: <1 – >2
This motherboard has 1 CPU power connectors, which is fewer than 45.2% of motherboards and equal to 54.9% of motherboards.
N. of fan headers
3
Market range: <3 – >8
This motherboard has 3 fan headers, which is fewer than 77.1% of motherboards and equal to 14.8% of motherboards.
Pump header
yes
This motherboard has a pump header. 22.1% of motherboards include this feature.
Pump header max current
0 A
Market range: <0 A – >3 A
This motherboard supports up to 0 A on the pump header, which is lower than that of 76.2% of motherboards and equal to that of 23.8% of motherboards.
Show more

ASUS Prime B550M-K vs the average motherboard

246810TotalPlatformMemoryStorageExpansionPortsNetworkAudioPower & Cooling
  • 1 more PCIe 4.0x16 slots
    This motherboard has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
    1 vs 0
  • 1 more USB 3.2 Gen2 ports
    This motherboard has more USB 3.2 Gen2 ports than the average motherboard (2 vs 1). The average motherboard has 1 USB 3.2 Gen2 port/s.
    2 vs 1
  • More up-to-date socket
    This motherboard uses a more up-to-date socket than the average motherboard (AM4 vs LGA 1151).
    AM4 vs LGA 1,151
  • Supports ECC memory
    This motherboard supports ECC memory, while the average motherboard does not. 20.9% of motherboards support ECC memory.
    ECC requires compatible CPU.
  • 1 more ARGB headers
    This motherboard has more ARGB headers than the average motherboard (3 vs 2). The average motherboard has 2 ARGB header/s.
    3 vs 2
  • 21.6% higher user score
    User score
    9.0/ 10
    ✕
    What it is
    How happy buyers are with this model, based on ratings from across the web.
    How we count it
    Enough data: A model needs at least 1 rating from across the web. Without one, it counts as 7.9, the mark of a weaker rated model in this category.
    Share: User score counts 10% of the overall score.
    Score distribution
    â–¼
    <55-66-77-88-99-10
    â–² Better than 79% of models

    70%

    8.6

    Rating

    30%

    10

    Popularity

    9.0 vs 7.4
  • 87.5% cheaper
    ASUS Prime B550M-K is cheaper than the average motherboard (£80 vs £150).
    £80 vs £150
  • 1 more PCIe x1 slots
    This motherboard has more PCIe x1 slots than the average motherboard (2 vs 1). The average motherboard has 1 PCIe x1 slot/s.
    2 vs 1
  • 21.6% higher user score
    User score
    9.0/ 10
    ✕
    What it is
    How happy buyers are with this model, based on ratings from across the web.
    How we count it
    Enough data: A model needs at least 1 rating from across the web. Without one, it counts as 7.9, the mark of a weaker rated model in this category.
    Share: User score counts 10% of the overall score.
    Score distribution
    â–¼
    <55-66-77-88-99-10
    â–² Better than 79% of models

    70%

    8.6

    Rating

    30%

    10

    Popularity

    9.0 vs 7.4
  • 87.5% cheaper
    ASUS Prime B550M-K is cheaper than the average motherboard (£80 vs £150).
    £80 vs £150
  • More up-to-date socket
    This motherboard uses a more up-to-date socket than the average motherboard (AM4 vs LGA 1151).
    AM4 vs LGA 1,151
  • Supports ECC memory
    This motherboard supports ECC memory, while the average motherboard does not. 20.9% of motherboards support ECC memory.
    ECC requires compatible CPU.
  • 1 more PCIe 4.0x16 slots
    This motherboard has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
    1 vs 0
  • 1 more PCIe x1 slots
    This motherboard has more PCIe x1 slots than the average motherboard (2 vs 1). The average motherboard has 1 PCIe x1 slot/s.
    2 vs 1
  • 1 more USB 3.2 Gen2 ports
    This motherboard has more USB 3.2 Gen2 ports than the average motherboard (2 vs 1). The average motherboard has 1 USB 3.2 Gen2 port/s.
    2 vs 1
  • 1 more ARGB headers
    This motherboard has more ARGB headers than the average motherboard (3 vs 2). The average motherboard has 2 ARGB header/s.
    3 vs 2
  • 60% lower LAN speed
    This motherboard has a lower LAN speed than the average motherboard (1 Gbps vs 2.5 Gbps). The average motherboard offers LAN speed of 2.5 Gbps.
    1 Gbps vs 2.5 Gbps
  • More basic chipset
    This motherboard uses a more basic chipset than the average motherboard (AMD B550 vs Intel B860).
    AMD B550 vs Intel B860
  • 2 fewer rear USB ports
    This motherboard has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.
    6 vs 8
  • Slower NVMe storage slots
    This motherboard has slower M.2 slots than the average motherboard (1x PCIe 4x4/SATA, 1x PCIe 3x4/SATA vs 1x PCIe 5x4, 2x PCIe 4x4).
    1x PCIe 4.0x4/SATA, 1x PCIe 3.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4
  • 27.4% lower review score
    Reviews score
    5.3/ 10
    ✕
    What it is
    Average grade from independent test sites, magazines and video reviewers, 1–10.
    How we count it
    Grades: Each review's own score is converted to 1–10; without one, we grade the review ourselves. Big test sites count more, short reviews half as much as full tests. A video review counts half.
    Score: The average grade is 80% of the review mark; the number of reviews is the other 20% (1 review = 5, the typical number in this category = 8, the most-reviewed model = 10).
    Enough data: With few reviews, the average grade is pulled toward the typical grade of this category. No reviews yet: 7.8 for now.
    Share: Reviews count 20% of the overall score.
    Score distribution
    â–¼
    <55-66-77-88-99-10
    â–¼ Worse than 84% of models

    5.3

    Mark 7.6 is below the typical mark 8.3 of this category, so it cannot lift the score above the technical score

    80%

    7.8

    Average grade

    20%

    6.9

    Popularity

    Grades by review (2)
    2 video reviews, each counting half as much as a written test. Reviews count 20% of the overall score.
    Ratings from across the web count in the User score, not in this score.
    5.3 vs 7.3
  • No Wi-Fi connectivity
    This motherboard does not support Wi-Fi connectivity, while the average motherboard does. 50.1% of motherboards support Wi-Fi connectivity.
  • No BIOS flashback support
    This motherboard does not support BIOS flashback, while the average motherboard does. 51.3% of motherboards support BIOS flashback.
  • 1 fewer rear USB-C ports
    This motherboard has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.
    0 vs 1
  • 27.4% lower review score
    Reviews score
    5.3/ 10
    ✕
    What it is
    Average grade from independent test sites, magazines and video reviewers, 1–10.
    How we count it
    Grades: Each review's own score is converted to 1–10; without one, we grade the review ourselves. Big test sites count more, short reviews half as much as full tests. A video review counts half.
    Score: The average grade is 80% of the review mark; the number of reviews is the other 20% (1 review = 5, the typical number in this category = 8, the most-reviewed model = 10).
    Enough data: With few reviews, the average grade is pulled toward the typical grade of this category. No reviews yet: 7.8 for now.
    Share: Reviews count 20% of the overall score.
    Score distribution
    â–¼
    <55-66-77-88-99-10
    â–¼ Worse than 84% of models

    5.3

    Mark 7.6 is below the typical mark 8.3 of this category, so it cannot lift the score above the technical score

    80%

    7.8

    Average grade

    20%

    6.9

    Popularity

    Grades by review (2)
    2 video reviews, each counting half as much as a written test. Reviews count 20% of the overall score.
    Ratings from across the web count in the User score, not in this score.
    5.3 vs 7.3
  • 29.3% lower sentiment score
    5.3 vs 7.5
  • 5.7% worse value for money
    ASUS Prime B550M-K has worse value for money than the average motherboard (7.28 vs 7.7).
    7.28 vs 7.7
  • More basic chipset
    This motherboard uses a more basic chipset than the average motherboard (AMD B550 vs Intel B860).
    AMD B550 vs Intel B860
  • No BIOS flashback support
    This motherboard does not support BIOS flashback, while the average motherboard does. 51.3% of motherboards support BIOS flashback.
  • Fewer BIOS update methods
    This motherboard offers fewer BIOS update methods than the average motherboard (UEFI utility, Windows app vs UEFI utility, flashback, Windows app).
    UEFI utility, Windows app vs UEFI utility, flashback, Windows app
  • Slower NVMe storage slots
    This motherboard has slower M.2 slots than the average motherboard (1x PCIe 4x4/SATA, 1x PCIe 3x4/SATA vs 1x PCIe 5x4, 2x PCIe 4x4).
    1x PCIe 4.0x4/SATA, 1x PCIe 3.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4
  • Fewer RAID options
    This motherboard offers fewer RAID levels than the average motherboard (0/1/10 vs 0/1/5/10).
    0/1/10 vs 0/1/5/10
  • No multi-GPU support
    This motherboard does not support multi-GPU, while the average motherboard does. 53.9% of motherboards support multi-GPU.
  • Less generous lane split
    This motherboard splits its PCIe lanes less generously than the average motherboard (x16/x1/x1 vs x16/x0/x4, x8/x8/x4).
    x16/x1/x1 vs x16/x0/x4, x8/x8/x4
  • 1 fewer PCIe 3.0x16 slots
    This motherboard has fewer PCIe 3.0x16 slots than the average motherboard (0 vs 1). The average motherboard has 1 PCIe 3.0x16 slot/s.
    runs at x1 mode
    0 vs 1
  • 2 fewer rear USB ports
    This motherboard has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.
    6 vs 8
  • 1 fewer rear USB-C ports
    This motherboard has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.
    0 vs 1
  • 3 fewer total USB connections
    This motherboard has fewer total USB connections than the average motherboard (12 vs 15). The average motherboard has 15 total USB connections.
    12 vs 15
  • 1 fewer DisplayPort outputs
    This motherboard has fewer DisplayPort outputs than the average motherboard (0 vs 1). The average motherboard has 1 DisplayPort outputs.
    0 vs 1
  • 1 fewer total USB-C connections
    This motherboard has fewer total USB-C connections than the average motherboard (0 vs 1). The average motherboard has 1 total USB-C connections.
    0 vs 1
  • 60% lower LAN speed
    This motherboard has a lower LAN speed than the average motherboard (1 Gbps vs 2.5 Gbps). The average motherboard offers LAN speed of 2.5 Gbps.
    1 Gbps vs 2.5 Gbps
  • No Wi-Fi connectivity
    This motherboard does not support Wi-Fi connectivity, while the average motherboard does. 50.1% of motherboards support Wi-Fi connectivity.
  • No Wi-Fi antenna included
    This motherboard does not include a Wi-Fi antenna, while the average motherboard does. 51.1% of motherboards include a Wi-Fi antenna.
  • 18 dB lower audio SNR
    This motherboard has a lower audio SNR than the average motherboard (97 dB vs 115 dB). The average motherboard has audio SNR of 115 dB.
    97 dB vs 115 dB
  • Less capable onboard audio
    This motherboard has a lower-end audio codec than the average motherboard (Realtek ALC887/897 vs Realtek ALC897).
    Realtek ALC887/897 vs Realtek ALC897
  • No optical S/PDIF out
    This motherboard does not have optical S/PDIF out, while the average motherboard does. 55.4% of motherboards include optical S/PDIF out.
  • Fewer VRM phases
    This motherboard has fewer VRM phases than the average motherboard (4+2 vs 10). The average motherboard has 10 VRM phase/s.
    4+2 vs 10
  • 2.5 fewer fan headers
    This motherboard has fewer fan headers than the average motherboard (3 vs 5.5). The average motherboard has 5.5 fan header/s.
    3 vs 5.5
  • 1 fewer RGB headers
    This motherboard has fewer RGB headers than the average motherboard (0 vs 1). The average motherboard has 1 RGB header/s.
    0 vs 1
  • 2 A lower pump header current limit
    This motherboard has a lower pump header current than the average motherboard (0 A vs 2 A). The average motherboard provides pump header current of 2 A.
    0 A vs 2 A

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

4.0
Older Tech Today
≈ estimated
15/08/2025
Hands-on review · VRM, audio and BIOS checks
Verdict
ASUS Prime B550M-K looks good on paper, but it is overpriced for what it delivers.
8.0
Mike's unboxing, reviews and how to
≈ estimated
18/10/2022
Hands-on review · stress testing and temperature tests
Verdict
ASUS Prime B550M-K is fine for most basic builds, but cooling and overclocking headroom are limited.

Third-party reviews

What customers like about ASUS Prime B550M-K

  • Affordable entry point for the B550 chipset and PCIe 4.0 support
  • Dual M.2 slots (one PCIe 4.0 and one PCIe 3.0) provide flexible storage options
  • Four RAM slots allow for easier memory expansion compared to other budget boards
  • Includes USB 3.2 Gen 2 ports for faster external data transfers
  • Compact Micro-ATX form factor fits well in smaller case builds
  • Intuitive BIOS and software controls for fan management (Fan Xpert 2+)

What customers don't like about ASUS Prime B550M-K

  • Weak VRM design without heatsinks, leading to potential thermal throttling under heavy loads
  • Not recommended for high-power CPUs like the Ryzen 9 5900X or for overclocking
  • Sparse rear I/O connectivity with a limited number of USB ports
  • May require a BIOS update to support newer Ryzen 5000 series processors out of the box
  • Budget build quality with no integrated I/O shield or advanced cooling features
  • Some users reported stability issues and random shutdowns over long-term use

Verdict

The ASUS Prime B550M-K is a budget-friendly micro-ATX motherboard designed for AMD Socket AM4, supporting 3rd Gen Ryzen and later 5000-series desktop processors. Key specifications include the AMD B550 chipset, PCIe 4.0 support for the primary x16 slot and one M.2 slot, four DDR4 DIMM slots supporting up to 128GB of memory at overclocked speeds reaching 4866MHz, and 1Gb Realtek Ethernet. Main pros include its affordability, ultrafast connectivity with dual M.2 slots (one PCIe 4.0 x4), and comprehensive cooling management via Fan Xpert 2+. However, its primary cons are its relatively weak 4+2 phase VRM design which lacks heatsinks, making it unsuitable for serious overclocking or high-power 12-core and 16-core CPUs under heavy workloads.

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