Retailer photo of ASUS PRIME B850M-K (Micro ATX). View this offer in Where to buy
ASUS · MOBO · AM5
ASUS PRIME B850M-K
Works well for: Gaming Build
Trade-offs: you want strong value with Balanced priorities specifically
- Socket
- AM5
- Chipset
- AMD B850
- Form factor
- Micro ATX
- Memory
- DDR5 · 2 slots
- M.2 slots
- 3
Move a slider and the page re-scores this product against the same market frame.
Is this a good buy today?
Market confidence: LowAt $180 the ASUS PRIME B850M-K is priced in line with its $180 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 B850M-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 B850M-K (Micro ATX) | Newegg | New | $180 | 38 | 2026-09-27 | View offer → |
| ASUS PRIME B850M-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.
#167 of 809 graded motherboards
- #164 ASUSASUS PRIME B850M-A 78
- #165 ASUSASUS PRIME B850M-A WIFI 78
- #166 ASUSASUS PRIME B850M-A WIFI-CSM 78
- #167 ASUSASUS PRIME B850M-K 78
- #168 ASUSASUS ROG STRIX B850-A GAMING WIFI 78
- #169 ASUSASUS ROG STRIX B850-E GAMING WIFI 78
- #170 ASUSASUS ROG STRIX B850-F GAMING WIFI 78
Value Balanced
How much of that you get for today’s price.
#302 of 849 currently priced motherboards
- #299 ASUSASUS TUF GAMING B650M-PLUS WIFI 38
- #300 ASUSASUS ROG STRIX X670E-E GAMING WIFI 38
- #301 ASUSASUS ROG CROSSHAIR X870E APEX 38
- #302 ASUSASUS PRIME B850M-K 38
- #303 GigabyteGigabyte Z790 D DDR4 38
- #304 ASUSASUS ROG Maximus XIII Extreme 38
- #305 MSIMSI Z390-A PRO 38
Performance Gaming Build
How much it can do. Price plays no part in this ranking.
#127 of 798 graded motherboards
- #124 MSIMSI MAG B650M MORTAR WIFI 90
- #125 MSIMSI PRO B650M-B 90
- #126 ASUSASUS ROG STRIX B650E-I GAMING WIFI 90
- #127 ASUSASUS PRIME B850M-K 90
- #128 ASUSASUS ROG STRIX B850-E GAMING WIFI 90
- #129 ASUSASUS ROG STRIX B850-F GAMING WIFI 90
- #130 ASUSASUS TUF GAMING B850-BTF WIFI W 90
Value Gaming Build
How much of that you get for today’s price.
#341 of 848 currently priced motherboards
- #338 GigabyteGigabyte Z590 GAMING X 32
- #339 ASUSASUS TUF GAMING Z790-BTF WIFI 32
- #340 ASUSASUS Z590 WIFI GUNDAM EDITION 32
- #341 ASUSASUS PRIME B850M-K 32
- #342 ASUSASUS Strix X470-F Gaming 32
- #343 ASUSASUS TUF X470-Plus Gaming 32
- #344 GigabyteGigabyte X570 AORUS MASTER 32
Performance Workstation
How much it can do. Price plays no part in this ranking.
#507 of 791 graded motherboards
- #504 GigabyteGigabyte Z390 AORUS ELITE 51
- #505 GigabyteGigabyte Z390 AORUS MASTER 51
- #506 GigabyteGigabyte Z390 GAMING X 51
- #507 ASUSASUS PRIME B850M-K 50
- #508 MSIMSI B850M GAMING WIFI 50
- #509 MSIMSI PRO B850M-G 50
- #510 ASUSASUS PRIME B560M-A 50
Value Workstation
How much of that you get for today’s price.
#465 of 824 currently priced motherboards
- #462 ASUSASUS PRIME Z370-A II 13
- #463 ASUSASUS Strix X470-F Gaming 13
- #464 GigabyteGigabyte B550 AORUS PRO 13
- #465 ASUSASUS PRIME B850M-K 13
- #466 MSIMSI MAG B550M BAZOOKA 13
- #467 MSIMSI B760M GAMING PLUS WIFI DDR4 13
- #468 ASUSASUS Strix Z370-E Gaming 13
Performance Small-Case Fit
How much it can do. Price plays no part in this ranking.
#78 of 809 graded motherboards
- #75 ASRockAsRock B850M Pro RS WiFi White 75
- #76 ASRockAsRock B850M Rock WiFi 75
- #77 ASUSASUS B850M-AYW-GAMING-WIFI 75
- #78 ASUSASUS PRIME B850M-K 75
- #79 ASUSASUS TUF GAMING B850M-E WIFI 75
- #80 GigabyteGigabyte B850M DS3H 75
- #81 GigabyteGigabyte B850M GAMING X WIFI6E 75
Value Small-Case Fit
How much of that you get for today’s price.
#99 of 849 currently priced motherboards
- #96 ASUSASUS TUF GAMING B850M-PLUS II 46
- #97 ASUSASUS TUF GAMING B850M-PLUS 45
- #98 MSIMSI B850M GAMING PLUS WIFI6E 45
- #99 ASUSASUS PRIME B850M-K 45
- #100 ASUSASUS PRIME B860M-A 45
- #101 GigabyteGigabyte B760I AORUS PRO 45
- #102 GigabyteGigabyte B550M AORUS PRO-P 45
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 Value38 | Higher capability MSI X870E GAMING PLUS WIFI 93 +29% capability · +11% price | Higher Value with current priorities Gigabyte X870 GAMING WIFI6 96 +16% capability · +10% price |
| Gaming BuildScenario capability | GradeA Value32 | Higher capability MSI PRO B650-P WIFI S 82 +11% capability · +11% price | Higher Value with current priorities Gigabyte X870 GAMING WIFI6 A 99 +1% capability · +10% price |
| WorkstationScenario capability | GradeD Value13 | Higher capability MSI X870E GAMING PLUS WIFI A 80 +90% capability · +11% price | Higher Value with current priorities Gigabyte X870 GAMING WIFI6 B 86 +71% capability · +10% price |
| Small-Case FitScenario capability | GradeC Value45 | Higher capability ASRock Z590 Phantom Gaming-ITX S 53 +32% capability · +5% price | Higher Value with current priorities Gigabyte B650M GAMING PLUS WF C 98 +0% capability · -32% 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 A 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 $62, against a cheapest tracked $180
- Workstation is what you actually need it forit grades only D there
Works well if
- Gaming Build is your main prioritygraded A 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: 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
- Workstation is not actually your main job — Gaming Build isit grades D for Workstation, but A for Gaming Build
Consider other options if
- Workstation is what you actually need it forit grades D 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 A for Gaming Build
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
- 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
- Value for money matters more to you than this exact modelGigabyte B650M GAMING PLUS WF holds Relative Value 98 against its 45 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 B850M-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
- DDR5
- Slots
- 2
- Maximum
- 128 GB
- ECC support
- No
Power / Interface
- Socket
- AM5
- Chipset
- AMD B850
- Form factor
- Micro ATX
Physical / Outputs
- M.2 slots
- 3
- PCIe ×16 slots
- 2
- USB ports
- 4
- Ethernet
- 2.5 Gb/s
Show all specifications
Features
- RAID
- Yes
Warranty
- Warranty
- 3 years
- Manufacturer part number
- PRIMEB850MK
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 · 2 slots · up to 128 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 B850M-K offers a balanced view across an all-round mix of priorities. It ranks #167 by capability in the current modelled field. Its clearest measured strength is feature score 51. ASRock B650 Pro RS WiFi currently clears the same practical bar with stronger Relative Value.
ASUS PRIME B850M-K offers A-grade capability for Gaming Build. It ranks #127 by capability in the current modelled field. Its clearest measured strength is feature score 51. ASRock B650 Pro RS WiFi currently clears the same practical bar with stronger Relative Value.
ASUS PRIME B850M-K offers D-grade capability for Workstation. It ranks #507 by capability in the current modelled field. Its clearest measured strength is feature score 51. The D grade is the decisive limitation for this workload.
ASUS PRIME B850M-K offers C-grade capability for Small-Case Fit. It ranks #78 by capability in the current modelled field. Its clearest measured strength is feature score 51. 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.