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 CAD 260 the ASUS PRIME B840M-A WIFI is priced 22% below its CAD 333 representative market level. Only 2 verified new offers stand behind it, so the level can move quickly.
Consider: ASUS B650E MAX GAMING WIFI offers stronger value around CAD 220.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 | CAD 260 | 56 | 2026-09-27 | View offer → |
| ASUS PRIME B840M-A WIFI (Micro ATX) | Newegg | New | CAD 405 | 41 | 2026-09-27 | View offer → |
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.
#432 of 633 graded motherboards
- #429 MSIMSI MPG Z390M GAMING EDGE AC 59
- #430 MSIMSI Z390-A PRO 59
- #431 ASUSASUS PRIME B840-PLUS WIFI 49
- #432 ASUSASUS PRIME B840M-A WIFI 49
- #433 MSIMSI PRO B840M-B 49
- #434 ASRockASRock B860M Pro RS 49
- #435 ASRockASRock B860M Pro-A WiFi 49
Value Balanced
How much of that you get for today’s price.
#117 of 652 currently priced motherboards
- #114 ASUSASUS ROG STRIX Z690-G GAMING WIFI 57
- #115 GigabyteGigabyte B850 GAMING WIFI6 57
- #116 ASUSASUS X870 MAX GAMING WIFI7 W 56
- #117 ASUSASUS PRIME B840M-A WIFI 56
- #118 ASUSASUS X870 MAX GAMING WIFI7 56
- #119 GigabyteGigabyte Z890M GAMING X 56
- #120 GigabyteGigabyte Z890 AORUS PRO ICE 56
Performance Gaming Build
How much it can do. Price plays no part in this ranking.
#314 of 624 graded motherboards
- #311 ASUSASUS PRIME B860M-A WIFI-CSM 79
- #312 ASRockASRock 90-MXBMS0-A0UAYZ 78
- #313 ASUSASUS PRIME B840-PLUS WIFI 78
- #314 ASUSASUS PRIME B840M-A WIFI 78
- #315 ASUSASUS ROG ZENITH EXTREME 78
- #316 ASRockASRock B860M Pro-A WiFi 78
- #317 ASRockASRock B860M-X 78
Value Gaming Build
How much of that you get for today’s price.
#215 of 650 currently priced motherboards
- #212 MSIMSI MPG Z690 CARBON WIFI 43
- #213 ASUSASUS PRIME B850M-A 43
- #214 ASUSASUS ROG STRIX Z690-A GAMING WIFI 43
- #215 ASUSASUS PRIME B840M-A WIFI 43
- #216 ASUSASUS PRIME B550-PLUS AC-HES 43
- #217 MSIMSI MAG Z690 TORPEDO 42
- #218 ASUSASUS TUF GAMING Z690-PLUS WIFI 42
Performance Workstation
How much it can do. Price plays no part in this ranking.
#205 of 617 graded motherboards
- #202 MSIMSI MAG B760 TOMAHAWK WIFI 75
- #203 MSIMSI PRO Z690-P DDR4 75
- #204 ASUSASUS PRIME B840-PLUS WIFI 74
- #205 ASUSASUS PRIME B840M-A WIFI 74
- #206 ASUSASUS TUF GAMING B850M-PLUS WIFI7 W 74
- #207 MSIMSI MAG X570S TOMAHAWK MAX WIFI 74
- #208 MSIMSI MPG X570S CARBON MAX WIFI 74
Value Workstation
How much of that you get for today’s price.
#188 of 639 currently priced motherboards
- #185 MSIMSI MPG Z690 CARBON WIFI 34
- #186 ASUSASUS ROG STRIX Z790-H GAMING WIFI 33
- #187 ASUSASUS TUF GAMING Z790-PLUS WIFI D4 33
- #188 ASUSASUS PRIME B840M-A WIFI 33
- #189 MSIMSI MEG X399 CREATION 33
- #190 ASUSASUS ROG CROSSHAIR VIII EXTREME 33
- #191 ASUSASUS PRIME B860M-A WIFI 33
Performance Small-Case Fit
How much it can do. Price plays no part in this ranking.
#89 of 633 graded motherboards
- #86 ASUSASUS PRIME B650M-A AX 74
- #87 ASUSASUS PRIME B650M-A II-CSM 74
- #88 ASUSASUS PRIME B650M-A WIFI 74
- #89 ASUSASUS PRIME B840M-A WIFI 74
- #90 ASUSASUS PRIME B850M-A 74
- #91 ASUSASUS PRIME B850M-A WIFI 74
- #92 ASUSASUS PRIME B850M-A WIFI-CSM 74
Value Small-Case Fit
How much of that you get for today’s price.
#27 of 652 currently priced motherboards
- #24 ASUSASUS PRIME B650M-A WIFI II 72
- #25 SapphireSapphire NITRO+ B850M WIFI 72
- #26 GigabyteGigabyte B550M GAMING X WIFI6 71
- #27 ASUSASUS PRIME B840M-A WIFI 71
- #28 ASUSASUS TUF GAMING B550M-PLUS WIFI II 70
- #29 ASUSASUS PRIME B550M-A AC 69
- #30 ASUSASUS ROG STRIX B650E-I GAMING WIFI 69
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 ASUS PRIME Z890M-PLUS WIFI 84 +83% capability · -8% price | Higher Value with current priorities ASUS B650E MAX GAMING WIFI 100 +79% capability · -15% price |
| Gaming BuildScenario capability | GradeB Value43 | Higher capability Higher capability · Higher Value with current priorities ASUS B650E MAX GAMING WIFI S 96 +19% capability · -15% price | |
| WorkstationScenario capability | GradeC Value33 | Higher capability Higher capability · Higher Value with current priorities ASUS PRIME Z890-P WIFI A 72 +23% capability · +8% price | |
| Small-Case FitScenario capability | GradeC Value71 | Higher capability Gigabyte B550I AORUS PRO AX S 44 +35% capability · +2% price | Higher Value with current priorities Gigabyte B650M GAMING PLUS WF C 99 +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 CAD 157, against a cheapest tracked CAD 260
- Value for money matters more to you than this exact modelASUS B650E MAX GAMING WIFI holds Relative Value 100 against its 56 with Balanced priorities, at CAD 220
- 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
- Value for money matters more to you than this exact modelASUS B650E MAX GAMING WIFI holds Relative Value 96 against its 43 for Gaming Build, at CAD 220
- Workstation is what you actually need it forit grades only C there
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; ASUS PRIME Z890-P WIFI grades A at CAD 280
- 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: ~CAD 191CAD 191 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; Gigabyte B550I AORUS PRO AX grades S at CAD 265
- Current price sits CAD 69 above the strong-value threshold (~CAD 191)cheapest tracked CAD 260 against a CAD 191 calculated threshold for Small-Case Fit
- Value for money matters more to you than this exact modelGigabyte B650M GAMING PLUS WF holds Relative Value 99 against its 71 for Small-Case Fit, at CAD 180
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 #432 by capability in the current modelled field. Its clearest measured strength is feature score 77. ASUS B650E MAX GAMING 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 #314 by capability in the current modelled field. Its clearest measured strength is feature score 77. The main limitation appears when Workstation becomes the priority, where it grades C.
ASUS PRIME B840M-A WIFI offers C-grade capability for Workstation. It ranks #205 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 #89 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.
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.