Asus Prime B850M-K-CSM M-ATX Motherboard

₹13,600

MRP ₹22,000 (incl. of all taxes)

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The PRIME B850M-K-CSM is a micro-ATX motherboard designed for building powerful desktop PCs with AMD Ryzen processors. It helps users get the most out of their AMD Ryzen 7000, 8000, and 9000 series CPUs.

Full specifications ↓

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Highlights

Supports up to 170W AMD CPUs for high-performance builds
Features DDR5 memory support up to 9600+MT/s with Ryzen 8000
Includes 2.5Gb Ethernet for fast internet connectivity
Offers PCIe 5.0 x16 slot for graphics cards and storage
Provides 2 M.2 slots with PCIe 5.0 and PCIe 4.0 speeds
Has USB 10Gbps ports for quick data transfer
Includes ASUS 5X PROTECTION III for durability
Features AEMP for better DDR5 memory performance

Specifications

Model	PRIME B850M-K-CSM
Socket	AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors*
CPU	Supports up to AMD 170W CPU
Chipset	AMD B850 Chipset
Memory	2 x DIMM slots, max. 128GB, DDR5 Supports up to 8200+MT/s(OC) with Ryzen™ 9000 Series Processors, 9600+MT/s(OC) with Ryzen™ 8000 Series Processors, 8000+MT/s(OC) with Ryzen™ 7000 Series Processors, ECC and Non-ECC Un-buffered DIMM*
Dual channel memory architecture	Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO™)	Supports AMD Extended Profiles for Overclocking (EXPO™)
ASUS Enhanced Memory Profile (AEMP)	ASUS Enhanced Memory Profile (AEMP)
Graphics	1 x DisplayPort 1 x HDMI™ port*
Expansion Slots	AMD Ryzen™ 9000 & 7000 Series Desktop Processors* 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen™ 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B850 Chipset 1 x PCIe 4.0 x16 slot (support x4 mode)
Storage	Supports 2 x M.2 slots and 4 x SATA 6Gb/s ports
M.2_1 slot (Key M), type 2280	M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280	M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
Ethernet	1 x Realtek 2.5Gb Ethernet
ASUS LANGuard	ASUS LANGuard
USB	Rear USB (Total 8 ports) 2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports
Audio	Realtek 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback
Back Panel I/O Ports	2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 1 x DisplayPort 1 x HDMI™ port 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks 1 x BIOS FlashBack™ button 1 x PS/2 Keyboard/Mouse combo port
Internal I/O Connectors	Fan and Cooling Related 1 x 4-pin CPU Fan header 3 x 4-pin Chassis Fan headers Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector Storage Related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C® ) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 3 x Addressable RGB Gen 2 headers 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin System Panel header
ASUS 5X PROTECTION III	ASUS 5X PROTECTION III - DIGI+ VRM - LANGuard - Overvoltage protection - SafeSlot - Stainless-steel back I/O
ASUS Q-Design	ASUS Q-Design - Q-Dashboard - Q-DIMM - Q-LED Core - Q-Slot
ASUS Thermal Solution	ASUS Thermal Solution - M.2 heatsink - VRM heatsink design
ASUS EZ DIY	ASUS EZ DIY - BIOS FlashBack™ button - BIOS FlashBack™ LED - SafeSlot
Aura Sync	Aura Sync - Addressable RGB Gen 2 headers
ASUS Exclusive Software	Armoury Crate - Aura Creator - Aura Sync - Fan Xpert 2+ ASUS AI Advisor ASUS DriverHub TurboV Core ASUS CPU-Z Norton 360 Deluxe (60 Days Free Trial) WinRAR (40 Days Free Trial)
UEFI BIOS	256 Mb Flash ROM, UEFI AMI BIOS
Manageability	WOL by PME, PXE
Form Factor	micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )
Operating System	Windows® 11, Windows® 10 64-bit

Who should buy it

This motherboard is ideal for PC builders who want to use AMD Ryzen 7000, 8000, or 9000 series processors. It may not be the best choice for users who need support for older processors or non-AMD systems.

Compatibility

Works with AMD Socket AM5 processors including Ryzen 7000, 8000, and 9000 series. Requires DDR5 memory and supports PCIe 5.0 and PCIe 4.0 storage devices. Compatible with Windows 10 and Windows 11 operating systems.

AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors
Supports up to AMD 170W CPU
AMD B850 Chipset
DDR5 memory
PCIe 5.0 and PCIe 4.0 slots
Realtek 2.5Gb Ethernet
USB 10Gbps and USB 5Gbps ports
M.2 slots for PCIe 5.0 and PCIe 4.0

What's in the box

2 x SATA 6Gb/s cables
1 x I/O Shield
1 x M.2 rubber package
1 x Screw package for M.2 SSD
1 x Quick start guide
1 x ACC Express activation key card

Frequently asked questions

What is the maximum memory speed supported by this motherboard?

DDR5 memory supports up to 9600+MT/s with Ryzen 8000 Series Processors.

Does this motherboard support PCIe 5.0 for both graphics and storage?

Yes, it has a PCIe 5.0 x16 slot for graphics cards and a PCIe 5.0 x4 M.2 slot for storage.

Can I use this motherboard with AMD Ryzen 7000 series processors?

Yes, it supports AMD Ryzen 7000 Series Desktop Processors.

What is the purpose of the BIOS FlashBack™ button?

The BIOS FlashBack™ button allows easy BIOS updates without needing a CPU or memory.

How many M.2 slots does this motherboard have and what are their speeds?

It has 2 M.2 slots: one supports PCIe 5.0 x4 and the other supports PCIe 4.0 x4.

Brand warranty: as per manufacturer from the manufacturer — TechCure India helps you with the claim.

Why buy from TechCure India

Genuine product with brand warranty
GST invoice on every order
Insured delivery across India
Free compatibility check before dispatch — or build a full PC with our PC Builder

Specifications

Brand	ASUS
Category	Motherboard
Model / MPN	PRIME B850M-K-CSM
Model	PRIME B850M-K-CSM
Socket	AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors*
CPU	Supports up to AMD 170W CPU
Chipset	AMD B850 Chipset
Memory	2 x DIMM slots, max. 128GB, DDR5 Supports up to 8200+MT/s(OC) with Ryzen™ 9000 Series Processors, 9600+MT/s(OC) with Ryzen™ 8000 Series Processors, 8000+MT/s(OC) with Ryzen™ 7000 Series Processors, ECC and Non-ECC Un-buffered DIMM*
Dual channel memory architecture	Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO™)	Supports AMD Extended Profiles for Overclocking (EXPO™)
ASUS Enhanced Memory Profile (AEMP)	ASUS Enhanced Memory Profile (AEMP)
Graphics	1 x DisplayPort 1 x HDMI™ port*
Expansion Slots	AMD Ryzen™ 9000 & 7000 Series Desktop Processors* 1 x PCIe 5.0 x16 slot (supports x16 mode) AMD Ryzen™ 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B850 Chipset 1 x PCIe 4.0 x16 slot (support x4 mode)
Storage	Supports 2 x M.2 slots and 4 x SATA 6Gb/s ports
M.2_1 slot (Key M), type 2280	M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280	M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
Ethernet	1 x Realtek 2.5Gb Ethernet
ASUS LANGuard	ASUS LANGuard
USB	Rear USB (Total 8 ports) 2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports
Audio	Realtek 7.1 Surround Sound High Definition Audio CODEC* - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback
Back Panel I/O Ports	2 x USB 10Gbps ports (2 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 4 x USB 2.0 ports (4 x Type-A) 1 x DisplayPort 1 x HDMI™ port 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks 1 x BIOS FlashBack™ button 1 x PS/2 Keyboard/Mouse combo port
Internal I/O Connectors	Fan and Cooling Related 1 x 4-pin CPU Fan header 3 x 4-pin Chassis Fan headers Power Related 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector Storage Related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C® ) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 3 x Addressable RGB Gen 2 headers 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin System Panel header
ASUS 5X PROTECTION III	ASUS 5X PROTECTION III - DIGI+ VRM - LANGuard - Overvoltage protection - SafeSlot - Stainless-steel back I/O
ASUS Q-Design	ASUS Q-Design - Q-Dashboard - Q-DIMM - Q-LED Core - Q-Slot
ASUS Thermal Solution	ASUS Thermal Solution - M.2 heatsink - VRM heatsink design
ASUS EZ DIY	ASUS EZ DIY - BIOS FlashBack™ button - BIOS FlashBack™ LED - SafeSlot
Aura Sync	Aura Sync - Addressable RGB Gen 2 headers
ASUS Exclusive Software	Armoury Crate - Aura Creator - Aura Sync - Fan Xpert 2+ ASUS AI Advisor ASUS DriverHub TurboV Core ASUS CPU-Z Norton 360 Deluxe (60 Days Free Trial) WinRAR (40 Days Free Trial)
UEFI BIOS	256 Mb Flash ROM, UEFI AMI BIOS
Manageability	WOL by PME, PXE
Form Factor	micro-ATX Form Factor 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )
Operating System	Windows® 11, Windows® 10 64-bit
Condition	New, sealed box
Warranty	Manufacturer warranty · details
Invoice	GST tax invoice (input credit available)
Delivery	Insured shipping to every serviceable pin code in India