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ASUS Prime X570-P vs GIGABYTE B550M K

Buy the GIGABYTE B550M K for a compact, low-cost build with a Ryzen 5 or Ryzen 7 and two NVMe drives. Buy the ASUS PRIME X570-P if you need a full ATX board, more PCIe lanes from the chipset, or plan on a 12- or 16-core chip with heavier power draw. The B550M K is the cheaper board at $78.98 at Walmart as of November 7, 2026; the X570-P is the larger, higher-tier platform.

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ASUS
ASUS PRIME X570-P

ASUS Prime X570-P

ASUS PRIME X570-P

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Choose the ASUS PRIME X570-P if you want a full-size ATX board with X570 chipset PCIe 4.0 lanes and CrossFire support for a high-core-count build.

Pros
  • X570 chipset gives more PCIe 4.0 lanes for add-in cards and drives.
  • Full ATX layout leaves room for large GPUs and extra cards.
  • CrossFire support for dual-GPU setups.
  • Four DIMM slots with ECC support up to 128 GB.
Cons
  • No price given, so cost versus the B550M K is unclear.
  • X570 boards typically run hotter and need chipset cooling.
  • ATX size will not fit small cases.
  • No M.2 slot count listed.
GIGABYTE
GIGABYTE B550M K

GIGABYTE B550M K

4.1(170 ratings)
$78.98at WalmartObserved Nov 7, 2026, 11:50 AM
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Choose the GIGABYTE B550M K if you want a small, cheap Micro-ATX board with dual M.2 slots for a mainstream Ryzen 5000 build.

Pros
  • Cheap at $78.98 at Walmart as of November 7, 2026.
  • Two M.2 slots for fast NVMe storage.
  • Micro-ATX fits smaller cases.
  • Q-Flash Plus updates BIOS without a CPU installed.
Cons
  • 4+2 power phase design limits headroom for 12- and 16-core chips.
  • No multi-GPU support.
  • Micro-ATX means fewer expansion slots than ATX.
  • Rated 4.1 out of 5 from 170 ratings, so some buyers report issues.

What separates them

ASUS Prime X570-PGIGABYTE B550M K
Form factorATXMicro-ATX
ChipsetAMD X570AMD B550
Power deliveryNot specified in listing; X570 boards generally carry stronger VRMs4+2 phase digital twin design
M.2 slotsNot specified in listingTwo NVMe PCIe 4.0/3.0 x4 slots
Multi-GPUCrossFire supportedNot supported
Memory4 slots, DDR4, 128 GB max, ECC4 slots, DDR4, 128 GB max, ECC
Video outputsHDMI, DisplayPortHDMI, DisplayPort, up to 5120 x 2880
PriceNot given$78.98 at Walmart as of November 7, 2026

Price history

  • ASUS Prime X570-P: lowest $84.99 on Nov 3 at mercari.com.
  • GIGABYTE B550M K: lowest $74.99 on Nov 3 at Newegg.com.

Prices at every store

ASUS Prime X570-P

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  • paymore.comCheck price at paymore.com
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Prices and history →

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
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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 →

Specs compared

SpecASUS Prime X570-PGIGABYTE B550M K
Form FactorATXMicro-ATX
Socket TypeSocket AM4AM4
RAM TypeDDR4DDR4
Expansion SlotPCI ExpressPCI Express
ECC SupportYesYes
ChipsetAMDAMD
External PortsEthernet, HDMI, DisplayPort, USBEthernet, HDMI, DisplayPort, USB
Number Of Memory Slots4 Memory Slots4 Memory Slots
Maximum RAM128 GB Max RAM128 GB Max RAM
GamingYes—
Multiple GPU SupportCrossfire—
Strength—two M.2 slots on a compact, inexpensive board.
Show all 35 specsShow fewer specs
SpecASUS Prime X570-PGIGABYTE B550M K
Motherboard Socket Type—AM4
Motherboard Chipset—AMD B550
Motherboard Form Factor—Micro-ATX
Motherboard Model—B550M K
Motherboard Series—GIGABYTE, AERO, AORUS
CPU Manufacturer—AMD
Manufacturer—GIGABYTE
CPU Compatibility—AMD Ryzen 5000 Series, AMD Ryzen 3000 Series
Motherboard Compatibility—Micro-ATX

What reviewers say

ASUS Prime X570-P

Owners generally see the Prime X570-P as a solid, no-frills X570 board that handles Ryzen CPUs well for the price. Complaints center on the missing Wi-Fi and USB-C and on the small chipset fan.

What people mention
  • ConnectivityCriticisedOwners note there is no Wi-Fi or Bluetooth, so a wired connection or add-in card is needed.
  • Chipset fanMixedSome find the small chipset fan audible under load, though others barely notice it.
  • Build and layoutPraisedBuilders describe a clean ATX layout with good clearance for coolers and graphics cards.
  • ValuePraisedBuyers see it as one of the cheaper ways to get X570 and PCIe 4.0.

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.

Questions and answers

Which is better for a Ryzen 9 5900X or 5950X?
The ASUS PRIME X570-P. The B550M K's 4+2 phase design is thin for a 12- or 16-core chip under sustained load, while X570 boards are built for higher current.
Which is better for a small case build?
The GIGABYTE B550M K. Its Micro-ATX size fits compact cases that an ATX board like the X570-P will not.
Is the B550M K worth the extra over the X570-P?
It is the cheaper board at $78.98 at Walmart as of November 7, 2026, and no X570-P price was given. For a mainstream Ryzen 5 build, the B550M K covers the basics at lower cost.
Do both support two NVMe drives?
The B550M K lists two PCIe 4.0/3.0 x4 M.2 slots. The X570-P's M.2 count is not specified, so check its manual before assuming two.
Which lasts longer?
Neither has a published lifespan. The X570-P's stronger platform is the safer bet for long-term use with a high-power CPU; the B550M K is fine for a modest chip kept at stock settings.
Do both support ECC memory?
Yes. Both list four DDR4 slots, 128 GB maximum, and ECC support.

More comparisons

  • ASUS PRIME X570-P vs Gigabyte A520M K V2 AMD AM4 Motherboard
  • GIGABYTE B550M K vs ASUS PRIME B450M-K II AMD B450 AM4 Micro ATX Motherboard
  • GIGABYTE B550M K vs Gigabyte A520M K V2 AMD AM4 Motherboard
RAM Maximum Capacity
—
128 GB
RAM Speed—3200 MHz
RAM Number Of Slots—4
RAM ECC Support—Yes
Discrete Graphics—No
Integrated Graphics—Yes
GPU Type—Integrated
Output Resolution—5120 x 2880 pixels
Multi Card Support—No
Memory Type—DDR4
Max Memory Capacity—128 GB
Memory Slots—4
color—Multicolor
size—Micro-ATX
  • ConnectivityMixedReviewers find the port selection adequate but note the lack of Wi-Fi and fewer USB ports.