Retailer photo of ASUS PRIME B550M-K (Micro ATX). View this offer in Where to buy
ASUS · MOBO · AM4
ASUS PRIME B550M-K
Trade-offs: you want strong value with Balanced priorities specifically
- Socket
- AM4
- Chipset
- AMD B550
- Form factor
- Micro ATX
- Memory
- DDR4 · 4 slots
- M.2 slots
- 2
Move a slider and the page re-scores this product against the same market frame.
Is this a good buy today?
Market confidence: LowAt $121 the ASUS PRIME B550M-K is priced in line with its $121 representative market level. Only one retailer currently backs that price, so the level is a single data point rather than a market.
Limited market: only one retailer currently has a verified offer, so treat this price as a single data point.
Prices & availability
Where to buy the ASUS PRIME B550M-K
Compare the offers we track for this model, across variants and retailers.
1 tracked offers · 1 retailers
| Variant | Store | Condition | Price (snapshot) | Value · Balanced | Checked | Offer link |
|---|---|---|---|---|---|---|
| ASUS PRIME B550M-K (Micro ATX) | Newegg | New | $121 | 33 | 2026-09-27 | View offer → |
| ASUS PRIME B550M-KMultiple variants available | Amazon Affiliate | Varies | Find on Amazon | Not tracked | No price snapshot | Find on Amazon → |
Prices are dated snapshots, not live quotes — confirm the final price at the store. New, refurbished and used offers are listed separately; used offers carry warranty and seller risk.
Where it stands in the field
Two different questions, side by side. Performance compares what the hardware can do; Value compares what that capability costs at today’s price. A product can rank high on one and low on the other — that gap is the point.
Performance Balanced
How much it can do. Price plays no part in this ranking.
#433 of 809 graded motherboards
- #430 ASUSASUS PRIME B550M-A 62
- #431 ASUSASUS PRIME B550M-A AC 62
- #432 ASUSASUS PRIME B550M-A WIFI II 62
- #433 ASUSASUS PRIME B550M-K 62
- #434 ASUSASUS PRIME B550M-K ARGB 62
- #435 ASUSASUS ROG STRIX B550-E GAMING 62
- #436 ASUSASUS ROG STRIX B550-F GAMING 62
Value Balanced
How much of that you get for today’s price.
#388 of 849 currently priced motherboards
- #385 ASUSASUS PRIME B660-PLUS D4 34
- #386 MSIMSI MEG Z790 GODLIKE 34
- #387 ASUSASUS ROG STRIX Z490-G GAMING 34
- #388 ASUSASUS PRIME B550M-K 33
- #389 MSIMSI B450M PRO-VDH MAX 33
- #390 MSIMSI Z270 GAMING M7 33
- #391 MSIMSI MPG X570S CARBON MAX WIFI 33
Performance Gaming Build
How much it can do. Price plays no part in this ranking.
#430 of 798 graded motherboards
- #427 MSIMSI B450M PRO-VDH PLUS 75
- #428 ASRockASRock B550M-HVS SE90-MXBMK0-A0UAYZ 75
- #429 ASRockASRock B550M-ITX 75
- #430 ASUSASUS PRIME B550M-K 75
- #431 ASUSASUS PRIME B550M-K ARGB 75
- #432 GigabyteGigabyte B550 GAMING X 75
- #433 GigabyteGigabyte B550 VISION D 75
Value Gaming Build
How much of that you get for today’s price.
#497 of 848 currently priced motherboards
- #494 ASUSASUS PRIME B860M-K 23
- #495 GigabyteGigabyte B550M DS3H AC R2 23
- #496 ASUSASUS B860M-E 23
- #497 ASUSASUS PRIME B550M-K 23
- #498 MSIMSI Z370M MORTAR 22
- #499 ASRockASRock B450M PRO4 R2.0 22
- #500 GigabyteGigabyte Z790 AORUS XTREME 22
Performance Workstation
How much it can do. Price plays no part in this ranking.
#542 of 791 graded motherboards
- #539 MSIMSI MAG B550M BAZOOKA 45
- #540 MSIMSI B450M PRO-VDH PLUS 44
- #541 ASRockASRock B550 Phantom Gaming 4 44
- #542 ASUSASUS PRIME B550M-K 44
- #543 ASUSASUS PRIME B550M-K ARGB 44
- #544 ASUSASUS TUF X470-Plus Gaming 44
- #545 ASUSASUS Pro B760M-C-CSM 44
Value Workstation
How much of that you get for today’s price.
#595 of 824 currently priced motherboards
- #592 MSIMSI MAG B560 TORPEDO 8
- #593 GigabyteGigabyte B550M DS3H AC R2 8
- #594 ASUSASUS PRIME H770-PLUS D4 8
- #595 ASUSASUS PRIME B550M-K 8
- #596 GigabyteGigabyte GA-Z270P-D3 8
- #597 GigabyteGigabyte Z390 GAMING X 8
- #598 ASUSASUS ROG STRIX B460-H GAMING 8
Performance Small-Case Fit
How much it can do. Price plays no part in this ranking.
#184 of 809 graded motherboards
- #181 MSIMSI B450M-A PRO MAX 69
- #182 ASRockASRock B550M-HDV 69
- #183 ASRockASRock B550M-HVS SE90-MXBMK0-A0UAYZ 69
- #184 ASUSASUS PRIME B550M-K 69
- #185 ASUSASUS PRIME B550M-K ARGB 69
- #186 ASUSASUS TUF GAMING B550M-E WIFI 69
- #187 GigabyteGigabyte B550M AORUS PRO 69
Value Small-Case Fit
How much of that you get for today’s price.
#246 of 849 currently priced motherboards
- #243 GigabyteGigabyte B850 AORUS ELITE WIFI7 32
- #244 GigabyteGigabyte B850 AORUS ELITE WIFI7 ICE 32
- #245 MSIMSI MEG Z890 ACE 32
- #246 ASUSASUS PRIME B550M-K 32
- #247 ASUSASUS B860M AYW GAMING WIFI 32
- #248 ASUSASUS TUF GAMING A620M-PLUS 32
- #249 GigabyteGigabyte X870E A ELITE X ICE 32
These ladders follow the preset scenario shown above. Your own weights re-score this product, not the whole field.
What it is good for
| Scenario | this productCapability grade · Value at current price | Higher capability | Higher Value with current priorities |
|---|---|---|---|
| Balanced (all-round)Weighted all-round view | GradeNo grade Value33 | Higher capability ASRock 90-MXBMS0-A0UAYZ 54 +25% capability · -9% price | Higher Value with current priorities Gigabyte B650M GAMING PLUS WF 89 +25% capability · +2% price |
| Gaming BuildScenario capability | GradeB Value23 | Higher capability MSI PRO B650M-B A 30 +20% capability · +5% price | Higher Value with current priorities Gigabyte B650M GAMING PLUS WF B 74 +12% capability · +2% price |
| WorkstationScenario capability | GradeD Value8 | Higher capability ASRock B650 Pro RS WiFi B 59 +93% capability · +16% price | Higher Value with current priorities Gigabyte B650M GAMING PLUS WF C 49 +48% capability · +2% price |
| Small-Case FitScenario capability | GradeC Value32 | Higher capability ASRock A620AI WiFi S 74 +37% capability · +8% price | Higher Value with current priorities Gigabyte B650M GAMING PLUS WF C 98 +9% capability · +2% price |
Balanced has no letter: it is a weighting preset, not a capability rubric. A grade answers “how well does this handle that job?” — price is never part of it. Relative Value puts the current market price back in.
Trade-offs
Works well if
- Gaming Build is your main prioritygraded B for Gaming Build on the same rubric as the tier list
Consider other options if
- You want strong value with Balanced priorities specificallyat today's market no realistic price for this model reaches strong value with Balanced priorities — the calculation only gets there near $35, against a cheapest tracked $121
- Workstation is what you actually need it forit grades only D there
Works well if
- Gaming Build is your main prioritygraded B for Gaming Build on the same rubric as the tier list
Consider other options if
- You want strong value for Gaming Build specificallycompeting products deliver so much more for Gaming Build per dollar that no price this model realistically trades at reaches the strong-value mark for this job
- Workstation is what you actually need it forit grades only D there
- You are buying for Gaming Build and want no asterisksthe rubric caps this grade: previous-generation socket — limited cpu upgrade path
For the selected scenario this is not a strong fit — the grade above is the reason, and the models below suit it better.
Works well if
- Workstation is not actually your main job — Gaming Build isit grades D for Workstation, but B for Gaming Build
Consider other options if
- Workstation is what you actually need it forit grades D there; ASRock B650 Pro RS WiFi grades B at $140
- You are buying for Workstation and want no asterisksthe rubric caps this grade: expansion data not collected for this board — graded on platform only
For the selected scenario this is not a strong fit — the grade above is the reason, and the models below suit it better.
Works well if
- Small-Case Fit is not actually your main job — Gaming Build isit grades C for Small-Case Fit, but B for Gaming Build
Consider other options if
- Small-Case Fit is what you actually need it forit grades C there; ASRock A620AI WiFi grades S at $131
- You want strong value for Small-Case Fit specificallycompeting products deliver so much more for Small-Case Fit per dollar that no price this model realistically trades at reaches the strong-value mark for this job
- You are buying for Small-Case Fit and want no asterisksthe rubric caps this grade: micro atx — fits compact mid-size cases
Every line states the fact it was derived from, for the scenario selected above. Thresholds are calculated points on our value curve — information about where the maths turns, not instructions about what to pay.
Similar options to the ASUS PRIME B550M-K
Chosen for Balanced
Chosen for Gaming Build
Chosen for Workstation
Chosen for Small-Case Fit
Alternatives stay near this product’s price range. Step-up options may exceed the standard budget envelope when the capability gain is meaningful.
Upgrade planner
Judge the change in the active scenario, then make the cash gap explicit.
Using page scenarioWhat are you upgrading from? These are the axes we compare on, and where this product stands in the current market.
Capability differences are expressed as tiers and index points, not as benchmark percentages we did not measure.
Specifications & compatibility
What this product is, and what to check before it goes into your build.
Memory
- Type
- DDR4
- Slots
- 4
- Maximum
- 128 GB
- ECC support
- No
Power / Interface
- Socket
- AM4
- Chipset
- AMD B550
- Form factor
- Micro ATX
Physical / Outputs
- M.2 slots
- 2
- SATA ports
- 4
- PCIe ×16 slots
- 1
- USB ports
- 3
- Ethernet
- 1 Gb/s
Show all specifications
Features
- RAID
- Yes
Warranty
- Warranty
- 3 years
- Manufacturer part number
- PRIMEB550MK
Hover any value to see where it came from: a manufacturer specification, or a figure The Comparator calculated.
Sources: Comparator offer frame 2026-09-27
What to check in your build
AM4
Takes AM4 processors — a matching socket is necessary but not sufficient, check the vendor's CPU support list
Micro ATX
Micro ATX — the case must accept this size
DDR4 · 4 slots · up to 128 GB
Takes DDR4 memory only — another DDR generation does not fit the slots
Found an error? Report this specification Email the field, corrected value and an optional source.
Compatibility guidance is practical help, not a score. Missing data is shown as unknown, never invented.
Summary
ASUS PRIME B550M-K offers a balanced view across an all-round mix of priorities. It ranks #433 by capability in the current modelled field. Its clearest measured strength is feature score 41. MSI B550M PRO-VDH WIFI currently clears the same practical bar with stronger Relative Value.
ASUS PRIME B550M-K offers B-grade capability for Gaming Build. It ranks #430 by capability in the current modelled field. Its clearest measured strength is feature score 41. ASUS PRIME B450M-A CSM currently clears the same practical bar with stronger Relative Value.
ASUS PRIME B550M-K offers D-grade capability for Workstation. It ranks #542 by capability in the current modelled field. Its clearest measured strength is feature score 41. The D grade is the decisive limitation for this workload.
ASUS PRIME B550M-K offers C-grade capability for Small-Case Fit. It ranks #184 by capability in the current modelled field. Its clearest measured strength is feature score 41. The C grade is the decisive limitation for this workload.
FAQ
Why does Relative Value change when I choose another scenario?
Each scenario changes the weights applied to capability, price and the other published factors. The hardware facts stay fixed, but the value question changes, so its score and rank can change too.
Why can Amazon appear without a tracked price?
Amazon is shown as a discovery link when we do not have a permitted verified price snapshot. It is excluded from price comparisons, rankings and Relative Value until a compliant tracked price exists.
Useful links & sources
offer frame 2026-09-27 · formula mobo-value-v1.4 · facts facts-2026-09-27 · Relative Value is an estimate from our current dataset, the selected weights and dated market prices — not an official product rating and not a price forecast. Target prices are calculation thresholds, not predictions. Methodology We are not a shop. Affiliate links may earn us a commission; they never change the calculations or the ranking.