Retailer photo of ASUS PRIME B840M-A WIFI (Micro ATX). View this offer in Where to buy
ASUS · MOBO · AM5
ASUS PRIME B840M-A WIFI
Trade-offs: you want strong value with Balanced priorities specifically
- Socket
- AM5
- Chipset
- AMD B840
- Form factor
- Micro ATX
- Memory
- DDR5 · 4 slots
- M.2 slots
- 4
Move a slider and the page re-scores this product against the same market frame.
Is this a good buy today?
Market confidence: MediumAt $180 the ASUS PRIME B840M-A WIFI is priced in line with its $182 representative market level. Only 2 verified new offers stand behind it, so the level can move quickly.
Consider: ASRock B650 Pro RS WiFi offers stronger value around $140.Compare
Prices & availability
Where to buy the ASUS PRIME B840M-A WIFI
Compare the offers we track for this model, across variants and retailers.
2 tracked offers · 2 retailers
| Variant | Store | Condition | Price (snapshot) | Value · Balanced | Checked | Offer link |
|---|---|---|---|---|---|---|
| ASUS PRIME B840M-A WIFI (Micro ATX) | ASUS | New | $180 | 56 | 2026-09-27 | View offer → |
| ASUS PRIME B840M-A WIFI (Micro ATX) | Newegg | New | $184 | 55 | 2026-09-27 | View offer → |
| ASUS PRIME B840M-A WIFIMultiple 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.
#543 of 809 graded motherboards
- #540 MSIMSI MPG Z390M GAMING EDGE AC 59
- #541 MSIMSI Z390-A PRO 59
- #542 ASUSASUS PRIME B840-PLUS WIFI 49
- #543 ASUSASUS PRIME B840M-A WIFI 49
- #544 ASUSASUS PRIME B840M-A-CSM 49
- #545 GigabyteGigabyte B840M DS3H 49
- #546 MSIMSI B840M GAMING PLUS WIFI6E 49
Value Balanced
How much of that you get for today’s price.
#126 of 849 currently priced motherboards
- #123 GigabyteGigabyte B850M DS3H 56
- #124 ASUSASUS PRIME B860M-A WIFI-CSM 56
- #125 ASUSASUS ROG MAXIMUS Z690 HERO 56
- #126 ASUSASUS PRIME B840M-A WIFI 56
- #127 ASUSASUS PRIME B650M-A WIFI II 56
- #128 GigabyteGigabyte B850 GAMING WIFI6 55
- #129 GigabyteGigabyte Z690 AERO G 55
Performance Gaming Build
How much it can do. Price plays no part in this ranking.
#376 of 798 graded motherboards
- #373 ASUSASUS ROG MAXIMUS X HERO 79
- #374 ASRockASRock 90-MXBMS0-A0UAYZ 78
- #375 ASUSASUS PRIME B840-PLUS WIFI 78
- #376 ASUSASUS PRIME B840M-A WIFI 78
- #377 ASRockASRock B860M Steel Legend WiFi 78
- #378 ASRockASRock B860M-X 78
- #379 ASUSASUS B860M-E 78
Value Gaming Build
How much of that you get for today’s price.
#224 of 848 currently priced motherboards
- #221 MSIMSI MEG Z690 GODLIKE 42
- #222 ASUSASUS PRIME B550M-A WIFI II 42
- #223 ASUSASUS PRIME B850M-A 41
- #224 ASUSASUS PRIME B840M-A WIFI 41
- #225 GigabyteGigabyte Z790 AORUS PRO X WIFI7 41
- #226 ASRockASRock B850M-X 41
- #227 MSIMSI MPG X570S EDGE MAX WIFI 41
Performance Workstation
How much it can do. Price plays no part in this ranking.
#208 of 791 graded motherboards
- #205 GigabyteGigabyte X870 GAMING X WIFI7 75
- #206 MSIMSI PRO Z690-P DDR4 75
- #207 ASUSASUS PRIME B840-PLUS WIFI 74
- #208 ASUSASUS PRIME B840M-A WIFI 74
- #209 ASUSASUS TUF GAMING B850M-PLUS WIFI7 W 74
- #210 MSIMSI MPG X570S CARBON MAX WIFI 74
- #211 ASUSASUS ROG CROSSHAIR X670E HERO 74
Value Workstation
How much of that you get for today’s price.
#201 of 824 currently priced motherboards
- #198 GigabyteGigabyte Z790 AORUS ELITE AX DDR4 35
- #199 MSIMSI B840M GAMING PLUS WIFI6E 34
- #200 ASUSASUS ROG MAXIMUS XII EXTREME 34
- #201 ASUSASUS PRIME B840M-A WIFI 34
- #202 ASUSASUS PRIME Z690-A 34
- #203 ASUSASUS ROG STRIX Z790-H GAMING WIFI 34
- #204 GigabyteGigabyte Z690 GAMING X 33
Performance Small-Case Fit
How much it can do. Price plays no part in this ranking.
#102 of 809 graded motherboards
- #99 ASUSASUS PRIME B860M-A WIFI-CSM 74
- #100 GigabyteGigabyte B650M D3HP 73
- #101 GigabyteGigabyte B650M D3HP AX 73
- #102 ASUSASUS PRIME B840M-A WIFI 73
- #103 ASUSASUS PRIME B840M-A-CSM 73
- #104 ASRockASRock B850M-X 73
- #105 ASRockASRock B850M-X R2.0 73
Value Small-Case Fit
How much of that you get for today’s price.
#33 of 849 currently priced motherboards
- #30 ASUSASUS PRIME B760M-A AX 70
- #31 ASUSASUS ROG STRIX Z690-I GAMING WIFI 70
- #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
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 Value56 | Higher capability MSI X870E GAMING PLUS WIFI 93 +104% capability · +11% price | Higher Value with current priorities Gigabyte X870 GAMING WIFI6 96 +83% capability · +10% price |
| Gaming BuildScenario capability | GradeB Value41 | Higher capability MSI PRO B650-P WIFI S 82 +28% capability · +11% price | Higher Value with current priorities Gigabyte X870 GAMING WIFI6 A 99 +17% capability · +10% price |
| WorkstationScenario capability | GradeC Value34 | Higher capability MSI X870E GAMING PLUS WIFI A 80 +28% capability · +11% price | Higher Value with current priorities Gigabyte X870 GAMING WIFI6 B 86 +15% capability · +10% price |
| Small-Case FitScenario capability | GradeC Value70 | Higher capability ASRock Z590 Phantom Gaming-ITX S 53 +35% capability · +5% price | Higher Value with current priorities Gigabyte B650M GAMING PLUS WF C 98 +3% capability · -31% 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 $107, against a cheapest tracked $180
- Workstation is what you actually need it forit grades only C 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 C there
- You are buying for Gaming Build and want no asterisksthe rubric caps this grade: entry chipset — no cpu overclocking headroom
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 C for Workstation, but B for Gaming Build
Consider other options if
- Workstation is what you actually need it forit grades C there; MSI X870E GAMING PLUS WIFI grades A at $200
- 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
- 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
- Strong-value threshold: ~$128$128 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 Z590 Phantom Gaming-ITX grades S at $189
- Current price sits $52 above the strong-value threshold (~$128)cheapest tracked $180 against a $128 calculated threshold for Small-Case Fit
- Value for money matters more to you than this exact modelGigabyte B650M GAMING PLUS WF holds Relative Value 98 against its 70 for Small-Case Fit, at $123
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 B840M-A WIFI
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
- DDR5
- Slots
- 4
- Maximum
- 192 GB
- ECC support
- No
Power / Interface
- Socket
- AM5
- Chipset
- AMD B840
- Form factor
- Micro ATX
Physical / Outputs
- M.2 slots
- 4
- SATA ports
- 4
- PCIe ×16 slots
- 3
- USB ports
- 4
- Wi-Fi
- WiFi 6E
- Ethernet
- 2.5 Gb/s
Show all specifications
Features
- RAID
- Yes
Warranty
- Warranty
- 3 years
- Manufacturer part number
- 90MB1J20MVAAYC
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
AM5
Takes AM5 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
DDR5 · 4 slots · up to 192 GB
Takes DDR5 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 B840M-A WIFI offers a balanced view across an all-round mix of priorities. It ranks #543 by capability in the current modelled field. Its clearest measured strength is feature score 77. ASRock B650 Pro RS WiFi currently clears the same practical bar with stronger Relative Value.
ASUS PRIME B840M-A WIFI offers B-grade capability for Gaming Build. It ranks #376 by capability in the current modelled field. Its clearest measured strength is feature score 77. ASRock B650 Pro RS WiFi currently clears the same practical bar with stronger Relative Value.
ASUS PRIME B840M-A WIFI offers C-grade capability for Workstation. It ranks #208 by capability in the current modelled field. Its clearest measured strength is feature score 77. The C grade is the decisive limitation for this workload.
ASUS PRIME B840M-A WIFI offers C-grade capability for Small-Case Fit. It ranks #102 by capability in the current modelled field. Its clearest measured strength is feature score 77. 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.