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GIGABYTE B550M K vs ASUS PRIME B450M-K II Motherboard

Buy the GIGABYTE B550M K for a new AM4 build with a Ryzen 5000 chip, four RAM sticks, or two NVMe drives. Buy the ASUS PRIME B450M-K II only if you already own a Ryzen 3000 or older CPU and want the cheaper, simpler board. The GIGABYTE is $78.98 at Walmart as of November 7, 2026; the ASUS listing shows no price here, so compare its store price before deciding.

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GIGABYTE
GIGABYTE B550M K

GIGABYTE B550M K

4.1(170 ratings)
$78.98at WalmartObserved Nov 7, 2026, 11:50 AM
See all prices and details
Visit Walmart

Choose the GIGABYTE B550M K if you want PCIe 4.0, dual M.2 slots, four DIMM slots, and headroom for a Ryzen 5000 CPU.

Pros
  • PCIe 4.0 x16 slot and dual PCIe 4.0/3.0 M.2 connectors
  • Four DIMM slots, 128 GB max, 3200 MHz rated
  • Q-Flash Plus updates BIOS without CPU, RAM, or GPU installed
  • RGB Fusion 2.0 and Smart Fan 5 headers
  • Runs Ryzen 5000 out of the box on current BIOS
Cons
  • 3+3 power phase limits it for high-core-count chips like the 5950X
  • Micro-ATX layout is cramped with a large GPU
  • Only one store lists it new at $78.98
  • 4.1 rating is lower than the ASUS board's
ASUS
ASUS PRIME B450M-K II AMD B450 AM4 Micro ATX Motherboard

ASUS PRIME B450M-K II Motherboard

ASUS PRIME B450M-K II AMD B450 AM4 Micro ATX Motherboard

4.6(191 ratings)
See all prices and details

Choose the ASUS PRIME B450M-K II if you are reusing an older Ryzen chip and only need two RAM slots and one M.2 drive.

Pros
  • Higher shopper rating, 4.6 of 5 from 191 ratings
  • Simple two-DIMM layout is easy to set up
  • Supports memory overclocking
  • Works with older AM4 Ryzen chips buyers may already own
Cons
  • B450 chipset caps PCIe at 3.0
  • Only one M.2 slot and two DIMM slots, 64 GB max
  • 2133 MHz rated RAM speed is low
  • No price shown in this listing, so value is unclear

What separates them

GIGABYTE B550M KASUS PRIME B450M-K II Motherboard
ChipsetAMD B550AMD B450
PCIe version for GPU and NVMePCIe 4.0 x16 and PCIe 4.0/3.0 M.2PCIe 3.0 only
M.2 slotsTwo NVMe M.2 slotsOne M.2 slot
RAM slots and max capacity4 DIMMs, up to 128 GB2 DIMMs, up to 64 GB
Rated RAM speed3200 MHz2133 MHz
CPU supportRyzen 5000, 5000 G, 4000 G, 3000AM4 Ryzen, older generations
Power design4+2 phase digital twin designBasic B450 VRM, fine for 65 W chips
Shopper rating4.1 of 5 from 170 ratings4.6 of 5 from 191 ratings

Price history

  • GIGABYTE B550M K: lowest $74.99 on Nov 3 at Newegg.com.
  • ASUS PRIME B450M-K II Motherboard: lowest $67.99 on Nov 3 at Techinn.com.

Prices at every store

GIGABYTE B550M K

  • WalmartNew

    In stockSold by Newegg Inc.Returns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $78.98Free shippingObserved Nov 7, 2026, 11:50 AM
    Visit Walmart

Also available at

  • AVADirect Custom ComputersCheck price at AVADirect Custom Computers
  • Newegg BusinessCheck price at Newegg Business
  • Newegg.comCheck price at Newegg.com
Prices and history →

ASUS PRIME B450M-K II Motherboard

  • eBayCheck price at eBay
  • Newegg.comCheck price at Newegg.com
  • Techinn.comCheck price at Techinn.com

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Prices and history →

Specs compared

SpecGIGABYTE B550M KASUS PRIME B450M-K II Motherboard
Motherboard Socket TypeAM4Socket AM4
Motherboard ChipsetAMD B550AMD B450
Motherboard Form FactorMicro-ATXMicro ATX
Motherboard ModelB550M KPRIME B450M-K II
Motherboard SeriesGIGABYTE, AERO, AORUSPrime B450M II Series
Form FactorMicro-ATXMicro ATX
ManufacturerGIGABYTEAsus
Socket TypeAM4AM4
CPU CompatibilityAMD Ryzen 5000 Series, AMD Ryzen 3000 SeriesAMD
Motherboard CompatibilityMicro-ATXMicro-ATX
RAM TypeDDR4DDR4
RAM Maximum Capacity128 GB64 GB
Show all 35 specsShow fewer specs
SpecGIGABYTE B550M KASUS PRIME B450M-K II Motherboard
RAM Speed3200 MHz2133 MHz
RAM Number Of Slots42
RAM ECC SupportYesYes (ECC), No (Non-ECC)
Discrete GraphicsNoNo
Integrated GraphicsYesYes (onboard graphics)
GPU TypeIntegratedIntegrated (onboard graphics)
Memory TypeDDR4DDR4
Max Memory Capacity128 GB64 GB
Memory Slots42
ECC Support

What reviewers say

GIGABYTE B550M K

  • 4.1 / 5170 ratings

Owners rate the B550M K around 4.1 out of 5, generally seeing it as solid value for a budget AM4 build. Praise centers on the dual M.2 slots and easy BIOS flashing; criticism targets the weak power delivery and sparse connectivity.

What people mention
  • Power deliveryCriticisedOwners say the 4+2 phase design is fine for mid-range Ryzen but not for high-core chips under sustained load.
  • M.2 slotsPraisedBuyers like getting two NVMe M.2 slots on an inexpensive board.
  • BIOS updatePraisedQ-Flash Plus lets users update the BIOS without a CPU, memory or GPU installed.
  • ConnectivityMixedReviewers find the port selection adequate but note the lack of Wi-Fi and fewer USB ports.

ASUS PRIME B450M-K II Motherboard

  • 4.6 / 5191 ratings

Buyers rate it 4.6 out of 5 from 191 ratings. Most call it a solid, no-frills board that works out of the box for budget builds. Complaints center on the two RAM slots and the need to update BIOS for newer Ryzen chips.

What people mention
  • ValuePraisedBuyers say it delivers what a budget build needs at a low price.
  • SetupPraisedOwners find installation and first boot straightforward.
  • Memory slotsCriticisedTwo DIMM slots limit upgrades and rule out four-stick setups.
  • BIOS supportMixed

Questions and answers

Which board is better for a Ryzen 5 5600?
The GIGABYTE B550M K. It supports Ryzen 5000 natively, gives PCIe 4.0, and has four RAM slots for future upgrades. The ASUS B450 board may need a BIOS update for Ryzen 5000.
Do I need PCIe 4.0?
Only if you use a PCIe 4.0 NVMe SSD or a recent GPU that benefits from the extra bandwidth. For a SATA SSD and a mid-range card, PCIe 3.0 on the ASUS is fine.
Which has more room for RAM?
The GIGABYTE. It has four DIMM slots and supports up to 128 GB at 3200 MHz. The ASUS has two slots and tops out at 64 GB.
Is the ASUS worth it if it costs less?
Only for a budget build with an older Ryzen chip and one storage drive. You give up a second M.2 slot, two RAM slots, and PCIe 4.0.
Which lasts longer for upgrades?
The GIGABYTE B550M K. The newer chipset, dual M.2, and four DIMM slots keep it useful longer as you add storage and memory.
Can both run without a graphics card?
Only with a Ryzen G-series APU. Both boards have HDMI and DisplayPort output, but neither has a discrete GPU.

More comparisons

  • GIGABYTE B550M K vs Gigabyte A520M K V2 AMD AM4 Motherboard
  • ASUS PRIME B450M-K II AMD B450 AM4 Micro ATX Motherboard vs Gigabyte B550M DS3H R2 Motherboard
  • ASUS PRIME X570-P vs GIGABYTE B550M K
Yes
Yes (ECC), No (Non-ECC)
Strengthtwo M.2 slots on a compact, inexpensive board.—
CPU ManufacturerAMD—
Output Resolution5120 x 2880 pixels—
Multi Card SupportNo—
Expansion SlotPCI Express—
ChipsetAMD—
External PortsEthernet, HDMI, DisplayPort, USB—
Number Of Memory Slots4 Memory Slots—
Maximum RAM128 GB Max RAM—
colorMulticolor—
sizeMicro-ATX—
Supports Overclocking—Yes
Memory Speed—2133 MHz
Newer Ryzen CPUs work, but some buyers had to update the BIOS first.