ASUS Motherboard PRIME B840M-K sAM5 B840 2xDDR5 M.2 HDMI mATX
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Features
The ASUS PRIME B840M-K motherboard, built on the AMD B840 chipset, targets compact AM5 systems with Ryzen 9000, 8000, and 7000 series processors. The primary PCIe 4.0 x16 slot supports current graphics cards with compatible CPUs, while the chipset provides a PCIe 3.0 x16 (x4) slot for basic expansion cards or controllers.
Memory uses two DIMM slots supporting up to 128 GB DDR5 with EXPO and AEMP profiles for straightforward overclocking. Storage includes dual PCIe 4.0 x4 M.2 slots and four SATA 6 Gb/s ports, enabling combinations of NVMe and conventional drives with RAID 0/1/5/10 capability.
Realtek 2.5Gb Ethernet with LANGuard delivers fast and protected wired connectivity. The rear panel features six USB ports, including four at 5 Gbps, and front headers support up to seven more, including Type-C. Realtek 7.1 audio with shielding and premium components suits everyday needs.
Thermal design incorporates a VRM heatsink and hybrid fan headers to maintain consistent temperatures. Three addressable RGB Gen 2 headers enable synchronized basic lighting for case or components.
Technologies (used)
- ASUS 5X PROTECTION III (DIGI+ VRM, LANGuard, overvoltage protection, SafeSlot Core+, stainless-steel back I/O).
- ASUS Q-Design (Q-Dashboard, Q-DIMM, Q-LED, Q-Slot).
- ASUS Thermal Solution (VRM heatsink).
- Aura Sync (three addressable RGB Gen 2 headers).
- AMD RAIDXpert2 (RAID 0/1/5/10).
- Armoury Crate with Fan Xpert 2+, AI Advisor, and DriverHub.
- AI Cache Boost for LLM optimization with Ryzen 9000.
Technical specifications
- Socket: AMD AM5.
- Chipset: AMD B840.
- Memory: 2 × DDR5 DIMM, up to 128 GB, up to 8000+ MT/s (OC).
- Graphics: 1 × HDMI 2.1 (4K@60Hz).
- Expansion slots: 1 × PCIe 4.0 x16, 1 × PCIe 3.0 x16 (x4).
- Storage: 2 × M.2 PCIe 4.0 x4, 4 × SATA 6 Gb/s.
- Networking: Realtek 2.5Gb Ethernet.
- USB: 6 rear (4 × 5 Gbps, 2 × 2.0), up to 7 front.
- Audio: Realtek 7.1, up to 24-bit/192 kHz.
- Form factor: micro-ATX (24.4 × 22.1 cm).
- BIOS: 32 Mb UEFI AMI.
- OS: Windows 11, Windows 10 64-bit.
Who it's for
- Users building compact work or multimedia PCs on the new AM5 platform.
- Owners of Ryzen processors with integrated graphics needing HDMI output.
- Those seeking an affordable board with DDR5 support and basic overclocking.
- People requiring 2.5Gb networking and a moderate number of interfaces without excess features.
Conclusion
The ASUS PRIME B840M-K provides a reliable foundation for modern Ryzen-based systems in a compact form factor. It suits everyday tasks, moderate overclocking, and a smooth transition to DDR5 without added complexity or cost.
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Box Contains:SATA Cable, I/O shield, M.2 Screw Package, Quick start guide
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Towards:gaming (overclocking), for home/office
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Form Factor:micro-ATX
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For processors:AMD
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Connection type:AM5
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Processor compatibility:AMD Ryzen 9000/8000/7000
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Northbridge (chipset):AMD B840
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UEFI BIOS:Yes
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Connector type:DDR5
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The maximum amount of memory GB:128
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Graphical interface:PCI-E x16 4.0
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HDMI Output:Yes
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Sound:7.1
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Connection interface:SATA 3, M.2
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SATA3 (6 Gb / s):4 ports
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LAN (RJ-45):2.5 Gbps
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Number of LAN-ports:1
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LAN-Controller Model:Realtek®
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USB 2.0 pcs:4
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USB 3.2 Gen 1:6
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USB 3.2 Type-C pcs:1
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M.2 connector:2
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BIOS:UEFI AMI
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Support software RAID:Yes
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Main power connector:24+8 -pin
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Аudiochip:Realtek®
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Dimensions (HxW):244 x 221
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DDR5:2 slots
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USB pcs:13
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Features:Digi+ VRM, Fan Xpert 2+, ASUS Q-Design, ASUS Thermal Solution, ASUS Exclusive Software, ASUS EZ DIY, ASUS 5X PROTECTION III, Synchronization backlight Asus Aura Sync, S/PDIF out header, CPU fan header, Front Panel Header, Front panel audio connector, COM port header, SPI TPM header, clear CMOS header, Chassis Fan headers, Support for Windows 10 64-bit, Support for Windows 11 64-bit, ASUS DriverHub, ASUS AI Advisor, Turbo V Core