ASUS 90MB1LC0-M0EAYC B850-PLUS-CSM Motherboard - Socket AM5, AMD B850, ATX, 1YR
90MB1LC0-M0EAYC
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- — Warranty: 1 Year Warranty
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- BrandASUS
- Processor socketSocket AM5
- Motherboard chipsetAMD B850
- Motherboard form factorATX
- Supported memory typesDDR5-SDRAM
- Number of memory slots4
- Number of M.2 (M) slots3
- Maximum internal memory256 GB
- Compatible processor seriesAMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
- Product colorMulticolour
- Weight1 kg
- Warranty1 Year Warranty
- All features
ASUS Prime B850-PLUS-CSM (90MB1LC0-M0EAYC) — ATX Motherboard for Socket AM5
Build a modern, stable PC with the ASUS Prime B850-PLUS-CSM (P/N 90MB1LC0-M0EAYC). Designed for advanced users and system builders, this ATX motherboard supports AMD Socket AM5 desktop processors (Ryzen™ 7000 / 8000 / 9000 series), DDR5 memory up to 256 GB, PCIe 5.0 graphics, fast storage options and robust networking for business and creative workloads. With ASUS reliability features, enhanced cooling and flexible connectivity, it’s a solid foundation for performance-focused AMD systems.
Why choose this motherboard
- Socket AM5 support for AMD Ryzen™ 7000, 8000 and 9000 series desktop processors
- High-speed DDR5 memory support — up to 256 GB across 4 DIMMs and 8000+ MT/s (OC)
- PCIe 5.0 x16 for next-generation graphics; multiple M.2 slots including PCIe 5.0 x4
- Reliable networking with Realtek 2.5Gb Ethernet and ASUS LANGuard
- Comprehensive ASUS software and hardware protections (BIOS FlashBack™, Aura Sync, Fan Xpert 2+, 5X Protection III)
Key features
- Chipset: AMD B850 — a modern platform ready for advanced desktop workloads and AI-ready systems
- Memory: 4 × DIMM DDR5, up to 256 GB total, supports AMD EXPO™ and ASUS Enhanced Memory Profile (AEMP)
- Storage: 3 × M.2 slots and 4 × SATA 6 Gb/s ports — includes PCIe 5.0 x4 support on the primary M.2
- Graphics outputs: DisplayPort and HDMI (HDMI 2.1 capability; up to 4K@60Hz via HDMI, up to 8K via DisplayPort 1.4 passthrough where supported)
- Audio: Realtek 7.1 HD Audio, up to 24-bit / 192 kHz, dedicated audio PCB layers and high-quality capacitors
- Cooling: VRM and M.2 heatsinks plus comprehensive fan controls
- Business/IT features: ASUS Control Center Express for remote IT management (where applicable)
- Form factor: ATX (30.5 × 24.4 cm)
- Color / style: Multicolour (RGB support via Aura Sync)
- Warranty: 1 year
Technical specifications
| Specification | Details |
|---|---|
| Product code (P/N) | 90MB1LC0-M0EAYC |
| Model | ASUS Prime B850-PLUS-CSM |
| Category | Motherboards |
| CPU Compatibility | AMD Socket AM5 — supports AMD Ryzen™ 7000, 8000 & 9000 series desktop processors |
| Chipset | AMD B850 |
| Socket | AM5 |
| Memory slots | 4 × DIMM |
| Maximum memory | 256 GB DDR5 |
| Memory speeds | Supports up to 8000+ MT/s (OC); AMD EXPO™ & ASUS AEMP support |
| PCIe | PCIe 5.0 x16 primary slot; additional PCIe lanes via chipset |
| M.2 slots | 3 × M.2 (primary M.2: PCIe 5.0 x4; additional M.2: PCIe 4.0 x4 where applicable) |
| SATA | 4 × SATA 6 Gb/s |
| RAID support | AMD RAIDXpert2 — RAID 0/1/5/10 (dependent on CPU/BIOS) |
| Rear display outputs | 1 × DisplayPort, 1 × HDMI (HDMI 2.1 / DP 1.4 support; 4K@60Hz via HDMI, 8K via DP passthrough where supported) |
| LAN | 1 × Realtek 2.5 Gb Ethernet with ASUS LANGuard |
| Wireless / Bluetooth | No onboard Wi‑Fi; no onboard Bluetooth |
| USB (rear) | 4 × USB 10 Gbps (including USB-C), 2 × USB 5 Gbps, 2 × USB 2.0 |
| USB (front headers) | Front-panel USB headers included, including USB-C header for chassis |
| Audio | Realtek 7.1 HD Audio — up to 24-bit / 192 kHz; dedicated audio PCB layers and premium capacitors |
| Cooling | VRM and M.2 heatsinks; advanced fan controls (Fan Xpert 2+) |
| Protection & reliability | ASUS 5X Protection III, BIOS FlashBack™, Armoury Crate, Aura Sync, Fan Xpert 2+, ASUS Control Center Express |
| Form factor / Dimensions | ATX — 30.5 × 24.4 cm |
| Color / Lighting | Multicolour / RGB support (Aura Sync) |
| Importer | Authorized importer: Visual D.G. |
| Warranty | 1 year |
Summary
The ASUS Prime B850-PLUS-CSM (90MB1LC0-M0EAYC) is an ATX motherboard that balances modern connectivity, expandability and enterprise-ready features. It’s ideal for system builders and prosumers who want Socket AM5 compatibility, DDR5 memory headroom up to 256 GB, PCIe 5.0 graphics support, fast M.2 storage and robust networking via 2.5 Gb Ethernet. Backed by ASUS hardware protections and management tools, it’s a dependable foundation for desktop productivity, creative workstations and small office deployments.
Main
Brand
ASUS
Warranty
1 Year Warranty
EAN/UPC code
4711387982037
BIOS
BIOS memory size
256 Mbit
BIOS type
UEFI AMI
Design
Cooling type
Passive
Product color
Multicolour
Expansion slots
1st M.2 highest PCI Express generation
5.0
1st M.2 largest key size
22110
Number of M.2 (M) slots
3
PCI Express x16 (Gen 4.x) slots
1
PCI Express x16 (Gen 5.x) slots
1
Features
Audio output channels
7.1 channels
Component for
PC
Motherboard chipset family
AMD
Motherboard form factor
ATX
Graphics
Parallel processing technology support
Not supported
Internal I/O
12V power connector
Yes
ATX Power connector (24-pin)
Yes
Chassis intrusion connector
Yes
CPU fan connector
Yes
EPS power connector (8-pin)
Yes
Front panel audio connector
Yes
Number of chassis fan connectors
4
Number of COM connectors
1
Number of CPU fan connectors
1
Number of RGB LED pin headers
3
Number of SATA III connectors
4
Number of water pump connectors
1
RGB LED pin header
Yes
S/PDIF out connector
Yes
Thunderbolt headers
1
USB 2.0 connectors
2
USB 3.0 (3.1 Gen 1) connectors
2
USB 3.1 (3.1 Gen 2) connectors
0
Memory
ECC сompatibility
ECC & Non-ECC
Maximum internal memory
256 GB
Memory channels
Dual-channel
Memory slots type
DIMM
Number of memory slots
4
Supported memory types
DDR5-SDRAM
Unbuffered memory
Yes
Network
Ethernet interface type
2.5 Gigabit Ethernet
Ethernet LAN
Yes
Top Wi-Fi standard
Not available
Packaging data
Package depth
273 mm
Package height
68 mm
Package weight
1.24 kg
Package width
353 mm
Performance
Motherboard chipset
AMD B850
Ports & interfaces
DisplayPorts quantity
1
DVI-D ports quantity
0
Ethernet LAN (RJ-45) ports
1
HDMI ports quantity
1
Line-in
Yes
Microphone in
Yes
USB 2.0 ports quantity
2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
2
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity
0
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
3
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity
1
VGA (D-Sub) ports quantity
0
Processor
Processor manufacturer
AMD
Processor socket
Socket AM5
Compatible processor series
AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Storage controllers
Number of HDDs supported
4
Number of storage drives supported
7
RAID support
Yes
Supported storage drive interfaces
M.2, SATA III
Supported storage drive types
HDD & SSD
Weight & dimensions
Depth
244 mm
Height
48 mm
Weight
1 kg
Width
305 mm
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