Retailer photo of ASUS PRIME B550M-A AC (Micro ATX). View this offer in Where to buy
ASUS · MOBO · AM4
ASUS PRIME B550M-A AC
Trade-offs: Current price sits $22 above the strong-value threshold (~$78)
- 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 $100 the ASUS PRIME B550M-A AC is priced in line with its $100 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-A AC
Compare the offers we track for this model, across variants and retailers.
2 tracked offers · 1 retailers
| Variant | Store | Condition | Price (snapshot) | Value · Balanced | Checked | Offer link |
|---|---|---|---|---|---|---|
| ASUS PRIME B550M-A AC (Micro ATX) | Newegg | New | $100 | 67 | 2026-09-27 | View offer → |
| ASUS PRIME B550M-A ACMultiple 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.
Show the other 1 tracked offers
| Variant | Store | Condition | Price (snapshot) | Value · Balanced | Checked | Offer link |
|---|---|---|---|---|---|---|
| ASUS PRIME B550M-A AC (Micro ATX) | Newegg | Used | $77 | 81 | 2026-09-27 | View offer → |
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.
#431 of 809 graded motherboards
- #428 ASRockASRock B550M-HVS SE90-MXBMK0-A0UAYZ 62
- #429 ASRockASRock B550M-ITX 62
- #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
Value Balanced
How much of that you get for today’s price.
#66 of 849 currently priced motherboards
- #63 ASUSASUS ROG STRIX Z890-A GAMING WIFI 68
- #64 GigabyteGigabyte X870E AORUS ELITE WIFI7 68
- #65 ASUSASUS TUF GAMING B850-E WIFI 67
- #66 ASUSASUS PRIME B550M-A AC 67
- #67 ASUSASUS TUF GAMING X870-PLUS WIFI 67
- #68 MSIMSI PRO Z790-P WIFI 66
- #69 ASUSASUS Z790-AYW WIFI W 66
Performance Gaming Build
How much it can do. Price plays no part in this ranking.
#526 of 798 graded motherboards
- #523 ASUSASUS PRIME B760M-A WIFI D4 73
- #524 MSIMSI B760 GAMING PLUS WIFI 73
- #525 ASUSASUS PRIME B550M-A 72
- #526 ASUSASUS PRIME B550M-A AC 72
- #527 ASUSASUS PRIME B550M-A WIFI II 72
- #528 ASRockASRock H810M-X 72
- #529 ASUSASUS Z170-A 72
Value Gaming Build
How much of that you get for today’s price.
#200 of 848 currently priced motherboards
- #197 MSIMSI MAG B550M MORTAR MAX WIFI 45
- #198 GigabyteGigabyte B650 EAGLE 45
- #199 MSIMSI MEG Z490 GODLIKE 45
- #200 ASUSASUS PRIME B550M-A AC 45
- #201 ASUSASUS TUF GAMING B550M-PLUS WIFI II 45
- #202 ASUSASUS 90MB1CV0-M0EAY0 44
- #203 ASUSASUS STRIX Z590-F GAMING WIFI 44
Performance Workstation
How much it can do. Price plays no part in this ranking.
#579 of 791 graded motherboards
- #576 ASUSASUS ROG STRIX B460-H GAMING 43
- #577 ASUSASUS TUF GAMING B460M-PLUS 43
- #578 ASUSASUS PRIME B550M-A 42
- #579 ASUSASUS PRIME B550M-A AC 42
- #580 ASUSASUS PRIME B550M-A WIFI II 42
- #581 GigabyteGigabyte B550M K 42
- #582 MSIMSI B850MPOWER 42
Value Workstation
How much of that you get for today’s price.
#315 of 824 currently priced motherboards
- #312 ASUSASUS ROG STRIX B860-F GAMING WIFI 22
- #313 MSIMSI MEG Z590 ACE GOLD EDITION 22
- #314 MSIMSI Z590 PRO WIFI 22
- #315 ASUSASUS PRIME B550M-A AC 22
- #316 MSIMSI B850M GAMING PLUS WIFI6E 22
- #317 ASUSASUS B850M-AYW-GAMING-WIFI 22
- #318 GigabyteGigabyte Z790 AORUS TACHYON 22
Performance Small-Case Fit
How much it can do. Price plays no part in this ranking.
#157 of 809 graded motherboards
- #154 MSIMSI MPG B760M EDGE TI WIFI 71
- #155 ASRockASRock H810M-X 71
- #156 ASUSASUS PRIME B550M-A 70
- #157 ASUSASUS PRIME B550M-A AC 70
- #158 ASUSASUS PRIME B550M-A WIFI II 70
- #159 MSIMSI B550M PRO-VDH 70
- #160 MSIMSI B550M PRO-VDH WIFI 70
Value Small-Case Fit
How much of that you get for today’s price.
#35 of 849 currently priced motherboards
- #32 ASUSASUS TUF GAMING B550M-PLUS WIFI II 70
- #33 ASUSASUS PRIME B840M-A WIFI 70
- #34 ASUSASUS ROG STRIX Z690-G GAMING WIFI 69
- #35 ASUSASUS PRIME B550M-A AC 69
- #36 GigabyteGigabyte B860M DS3H WIFI6E 67
- #37 ASUSASUS b650m-ayw-wifi 66
- #38 ASUSASUS PRIME Z790M-PLUS 66
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 Value67 | Higher capability ASRock 90-MXBMS0-A0UAYZ 54 +25% capability · +10% price | Higher Value with current priorities MSI B550M PRO-VDH WIFI 83 +0% capability · -10% price |
| Gaming BuildScenario capability | GradeC Value45 | Higher capability ASUS PRIME B450M-A CSM B 38 +11% capability · -13% price | Higher Value with current priorities MSI B550M PRO-VDH WIFI C 54 +3% capability · -10% price |
| WorkstationScenario capability | GradeD Value22 | Higher capability Gigabyte B550 GAMING X V2 D 15 +48% capability · +0% price | Higher Value with current priorities MSI B550M PRO-VDH WIFI D 29 +2% capability · -10% price |
| Small-Case FitScenario capability | GradeC Value69 | Higher capability ASRock B550M-ITX A 36 +34% capability · -6% price | Higher Value with current priorities MSI B550M PRO-VDH WIFI C 85 +0% capability · -10% 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 C for Gaming Build on the same rubric as the tier list
- Strong-value threshold: ~$78$78 is where Relative Value reaches 80 with Balanced priorities, in the 2026-09-27 offer frame
Consider other options if
- Current price sits $22 above the strong-value threshold (~$78)cheapest tracked $100 against a $78 calculated threshold with Balanced priorities
- Value for money matters more to you than this exact modelMSI B550M PRO-VDH WIFI holds Relative Value 83 against its 67 with Balanced priorities, at $90
- Workstation is what you actually need it forit grades only D there
For the selected scenario this is not a strong fit — the grade above is the reason, and the models below suit it better.
Consider other options if
- Gaming Build is what you actually need it forit grades C there; ASUS PRIME B450M-A CSM grades B at $87
- 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
- Value for money matters more to you than this exact modelMSI B550M PRO-VDH WIFI holds Relative Value 54 against its 45 for Gaming Build, at $90
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 C for Gaming Build
Consider other options if
- Workstation is what you actually need it forit grades D there; Gigabyte B550 GAMING X V2 grades D at $100
- You want strong value for Workstation specificallycompeting products deliver so much more for Workstation per dollar that no price this model realistically trades at reaches the strong-value mark for this job
- Value for money matters more to you than this exact modelMSI B550M PRO-VDH WIFI holds Relative Value 29 against its 22 for Workstation, at $90
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 C for Gaming Build
- Strong-value threshold: ~$69$69 is where Relative Value reaches 80 for Small-Case Fit, in the 2026-09-27 offer frame
Consider other options if
- Small-Case Fit is what you actually need it forit grades C there; ASRock B550M-ITX grades A at $94
- Current price sits $31 above the strong-value threshold (~$69)cheapest tracked $100 against a $69 calculated threshold for Small-Case Fit
- Value for money matters more to you than this exact modelMSI B550M PRO-VDH WIFI holds Relative Value 85 against its 69 for Small-Case Fit, at $90
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-A AC
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
- Wi-Fi
- Wi-Fi 5 Bluetooth v5.0
- Ethernet
- 1 Gb/s
Show all specifications
Features
- Fan headers
- 4
- RAID
- Yes
- ARGB headers
- Yes
Warranty
- Warranty
- 3 years
- Manufacturer part number
- PRIMEB550MAAC
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-A AC offers a balanced view across an all-round mix of priorities. It ranks #431 by capability in the current modelled field. Its clearest measured strength is feature score 58. MSI B550M PRO-VDH WIFI currently clears the same practical bar with stronger Relative Value.
ASUS PRIME B550M-A AC offers C-grade capability for Gaming Build. It ranks #526 by capability in the current modelled field. Its clearest measured strength is feature score 58. The C grade is the decisive limitation for this workload.
ASUS PRIME B550M-A AC offers D-grade capability for Workstation. It ranks #579 by capability in the current modelled field. Its clearest measured strength is feature score 58. The D grade is the decisive limitation for this workload.
ASUS PRIME B550M-A AC offers C-grade capability for Small-Case Fit. It ranks #157 by capability in the current modelled field. Its clearest measured strength is feature score 58. 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.