I have an NVMe 3.0x4 SSD. If I get a 4.0x4, can I use it as a boot device AND use the 3.0x4 on the secondary slot and still get full or nearly full performance from both? The only time I would use the 3.0x4 is for games that wouldn't fit on my Boot drive, and in that case I would barely be using the 4.0x4 I'm thinking of getting.

Yes, you can use a PCIe 4.0 x4 NVMe SSD as a boot device and a PCIe 3.0 x4 NVMe SSD in the secondary slot. The ASUS PRIME B550M-K motherboard supports 1 x M.2 Socket 3 with PCIe 4.0 x4 and SATA modes for 3rd Gen AMD Ryzen Processors, and 1 x M.2 Socket 3 with PCIe 3.0 x4 and SATA modes for the AMD B550 Chipset.

GIGABYTE B550 EAGLE WIFI6 Motherboard, Supports AMD AM4 Ryzen 5000 Processors, ATX, DDR4, 2x M.2, PCIe 4.0, WIFI6, 1GbE LAN, EZ-Latch

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ASUS PRIME B550M-K AM4 AMD B550 USB 3.0 HDMI Micro ATX AMD Motherboard

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Option: PRIME B550M-K

PRIME B550-PLUS
PRIME B550M-A/CSM
PRIME B550M-K
ROG STRIX B550-E GAMING
ROG STRIX B550-F GAMING
ROG STRIX B550-F GAMING (WI-FI)
ROG STRIX B550-F GAMING WIFI II
ROG STRIX B550-I GAMING
TUF GAMING B550-PLUS
TUF GAMING B550M-PLUS
TUF GAMING B550M-PLUS (WI-FI)
TUF GAMING B550-PLUS WIFI II
PRIME B550-PLUS AC-HES
PRIME B550M-A WIFI II

AMD B550
BIOS update might require for AMD Zen 3 Ryzen 5000 series CPU
3rd Gen AMD Ryzen Processors
DDR4 4600(O.C)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory
Next Generation AMD Ryzen PRO Processors
DDR4 4800(O.C.)/ 4600(O.C)/ 4466(O.C.)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory
ECC Memory (ECC mode) support varies by CPU.

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Overview

Specs

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Model
Brand	ASUS
Model	PRIME B550M-K

Supported CPU
CPU Socket Type	AM4
CPU Type	BIOS update might require for AMD Zen 3 Ryzen 5000 series CPU. Refer to ASUS website for CPU support list.

Chipsets
Chipset	AMD B550

Memory
Number of Memory Slots	4x288pin (DDR4)
Memory Standard	3rd Gen AMD Ryzen Processors DDR4 4600(O.C)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory * Next Generation AMD Ryzen PRO Processors DDR4 4800(O.C.)/ 4600(O.C)/ 4466(O.C.)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory * ECC Memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
Maximum Memory Supported	128GB
Channel Supported	Dual Channel

Expansion Slots
PCI Express 4.0 x16	3rd Gen AMD Ryzen Processors 1 x PCIe 4.0 x16 (x16 mode)
PCI Express 3.0 x16	1 x PCI Express 3.0 x16
PCI Express x16	None
PCI Express x1	AMD B550 Chipset 2 x PCIe 3.0 x1

Storage Devices
Serial ATA (SATA)	4 x SATA 6Gb/s
M.2	3rd Gen AMD Ryzen Processors: 1 x M.2 Socket 3, with M Key, Type 2242/2260/2280/22110 (PCIE 4.0 x4 and SATA modes) storage devices support AMD B550 Chipset: 1 x M.2 Socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support
SATA RAID	0/1/10

Onboard Video
Onboard Video Chipset	Supported only by CPU with integrated graphic: 1 x D-Sub 1 x DVI-D 1 x HDMI 2.1(4K@60HZ)

Onboard Audio
Audio Chipset	Realtek ALC887
Audio Channels	7.1 Channels

Onboard LAN
LAN Chipset	Realtek RTL8111H
Max LAN Speed	1Gbps

Rear Panel Ports
Back I/O Ports	1 x PS/2 keyboard/mouse combo port(s) 1 x DVI-D 1 x D-Sub 1 x HDMI 1 x LAN (RJ45) port(s) 2 x USB 3.2 Gen 2 (teal blue) (2 x Type-A) 4 x USB 3.2 Gen 1 (blue) Type-A 3 x Audio jack(s)
HDMI	1 x HDMI
USB 3.0	2 x USB 3.0

Internal I/O Connectors
Onboard USB	1 x USB 3.2 Gen 1 (up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)
Other Connectors	1 x CPU Fan connector(s) 2 x Chassis Fan connector(s) 1 x SPI TPM header 1 x S/PDIF out header(s) 1 x Front panel audio connector(s) (AAFP) 1 x Clear CMOS jumper(s) 1 x System panel connector 1 x COM port header 1 x Speaker connector

Physical Spec
Form Factor	Micro ATX
LED Lighting	None RGB
Dimensions (W x L)	9.6" x 9.6"
Power Pin	1 x 24-pin EATX Power connector(s) 1 x 8-pin EATX 12V Power connectors

Software Feature
Windows 11	Supported

Features
Features	Software Features: ASUS Exclusive Software Armoury Crate AI Suite 3 - Performance And Power Saving Utility TurboV EVO EPU Digi+ VRM Fan Xpert 2+ - EZ update ASUS CPU-Z AI Charger DAEMON Tools Norton Anti-virus software (Free Trial for 60 days) WinRAR UEFI BIOS ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUS EZ Flash 3 - ASUS UEFI BIOS EZ Mode ASUS Special Features: ASUS 5X PROTECTION III - ASUS DIGI+ VRM - ASUS LANGuard - ASUS Overvoltage Protection - ASUS SafeSlot Core - ASUS Stainless-Steel Back I/O ASUS Q-Design - ASUS Q-DIMM - ASUS Q-Slot ASUS Thermal Solution - Aluminum heatsink design ASUS Lighting Control BIOS: 256MB Flash ROM, UEFI AMI BIOS Manageability: WOL by PXE Operating System: Windows 10 64-bit

Packaging
Package Contents	Accessories: User's manual I/O Shield 2 x SATA 6Gb/s cable(s) 1 x Supporting DVD 1 x M.2 SSD screw package(s)

Additional Information
First Listed on Newegg	June 17, 2026

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