Asus Prime B850M-K (Socket AM5) DDR5 Micro-ATX Motherboard
Product Technical Specification
| Form Factor | |
| Motherboard formfactor | Micro-ATX |
| Wi-Fi & LAN | |
| LAN | Yes |
| LAN Ports | 1x 2.5 Gbit/s |
| Wi-Fi / Bluetooth | No |
| Colour | |
| Primary Colour | Black |
| Lighting | |
| Lighting / RGB | Yes |
| Motherboard | |
| Motherboard Chipset | AMD B850 |
| CPU | |
| CPU Manufacturer | AMD |
| CPU Socket | AM5 |
| Fan Header | |
| 4 Pin Fan Connectors | 4 |
| Memory | |
| Max. Memory | 128 GB |
| Memory Type | DDR5 |
| Memory Form Factor | DIMM |
| Memory slots | 2x |
| Internal Ports | |
| CPU Power Supply | 1x 8-Pin |
Delivery Options
Economy Delivery (UK)
Business Express
| Component | Specification |
|---|---|
| Note | The specifications are subject to change without notice. |
| CPU | AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors * Refer to support list. |
| Chipset | AMD B850 Chipset |
| Memory |
2 x DIMM slots, Max. 128GB, DDR5 Supports: - 8200+MT/s(OC) with Ryzen™ 9000 - 8400+MT/s(OC) with Ryzen™ 8000 - 8000+MT/s(OC) with Ryzen™ 7000 ECC and Non-ECC, Un-buffered DIMM Dual Channel Architecture Supports AMD EXPO™, ASUS AEMP * See support list for memory compatibility and configuration details. |
| Graphics |
1 x DisplayPort (max. 8K@30Hz, DP 1.4) 1 x HDMI™ port (max. 4K@60Hz, HDMI 2.1) * Specs may vary by CPU. See AMD CPU specs. |
| Expansion Slots |
Ryzen™ 9000 & 7000: 1 x PCIe 5.0 x16 Ryzen™ 8000: 1 x PCIe 4.0 x16 (x8/x4) B850 Chipset: 1 x PCIe 4.0 x16 (x4) * Refer to bifurcation table. |
| Storage |
2 x M.2 slots 4 x SATA 6Gb/s ports Ryzen™ 9000 & 7000: M.2_1 PCIe 5.0 x4, M.2_2 PCIe 4.0 x4 Ryzen™ 8000: M.2_1 PCIe 4.0 x4, M.2_2 PCIe 4.0 x4/x2 AMD RAIDXpert2: RAID 0/1/5/10 (9000), RAID 0/1 (8000), RAID 0/1/10 (7000) |
| Ethernet | 1 x Realtek 2.5Gb Ethernet, ASUS LANGuard |
| USB |
Rear: 2 x USB 10Gbps (Type-A), 2 x USB 5Gbps, 4 x USB 2.0 Front: 1 x USB-C 5Gbps, 1 x USB 5Gbps header (2 ports), 2 x USB 2.0 headers (4 ports) * USB-C PD max: 5V/3A |
| Audio |
Realtek 7.1 Surround HD Audio CODEC - Jack-detection, Multi-streaming, Front Panel Jack-retasking - Up to 24-Bit/192 kHz playback - Audio shielding, premium capacitors, dedicated PCB layers * Requires HD audio module chassis for 7.1 output. |
| Back Panel I/O |
2 x USB 10Gbps, 2 x USB 5Gbps, 4 x USB 2.0 1 x DisplayPort, 1 x HDMI 1 x 2.5Gb LAN, 3 x Audio jacks 1 x BIOS FlashBack™, 1 x PS/2 |
| Internal I/O |
Cooling: 1 x CPU Fan, 3 x Chassis Fan headers Power: 1 x 24-pin, 1 x 8-pin +12V CPU Storage: 2 x M.2, 4 x SATA USB: 1 x USB-C 5Gbps, 1 x USB 5Gbps header, 2 x USB 2.0 headers Misc: 3 x ARGB Gen 2, Clear CMOS, COM, F_AUDIO, S/PDIF, SPI TPM, Front Panel header |
| Special Features |
ASUS 5X PROTECTION III: DIGI+ VRM, LANGuard, Overvoltage Protection, SafeSlot, Stainless I/O ASUS Q-Design: Q-DIMM, Q-LED Core, Q-Slot, Q-Dashboard Thermal: M.2 heatsink, VRM heatsink DIY: BIOS FlashBack™, LED, SafeSlot Aura Sync: 3 x ARGB Gen 2 |
| Software Features |
Armoury Crate: Aura Creator, Aura Sync, Fan Xpert 2+ AI Advisor, DriverHub, CPU-Z, TurboV Core Creative Cloud (Trial), Norton 360 (60 Days), WinRAR (Trial) UEFI BIOS: CrashFree, EZ Flash 3, MyHotkey, EZ Mode |
| BIOS | 256 Mb Flash ROM, UEFI AMI BIOS |
| Manageability | WOL by PME, PXE |
| Accessories |
2 x SATA cables 1 x I/O Shield 1 x M.2 Rubber Package 1 x M.2 Screw package 1 x Quick Start Guide |
| Operating System | Windows® 11, Windows® 10 64-bit |
| Form Factor | micro-ATX, 9.6 x 8.7 inches (24.4 x 22.1 cm) |
| Form Factor | |
| Motherboard formfactor | Micro-ATX |
| Wi-Fi & LAN | |
| LAN | Yes |
| LAN Ports | 1x 2.5 Gbit/s |
| Wi-Fi / Bluetooth | No |
| Colour | |
| Primary Colour | Black |
| Lighting | |
| Lighting / RGB | Yes |
| Motherboard | |
| Motherboard Chipset | AMD B850 |
| CPU | |
| CPU Manufacturer | AMD |
| CPU Socket | AM5 |
| Fan Header | |
| 4 Pin Fan Connectors | 4 |
| Memory | |
| Max. Memory | 128 GB |
| Memory Type | DDR5 |
| Memory Form Factor | DIMM |
| Memory slots | 2x |
| Internal Ports | |
| CPU Power Supply | 1x 8-Pin |
Buykingston order despatch times:
We will despatch your order the very same day if we receive cleared payment by 12:00 pm Mon-Fri.
These delivery estimates apply when you order up to 12:00 pm Mon-Fri (excluding public holidays).
We charge a one off delivery cost as outlined below regardless of how many items you order or the weight of your order.
Estimated delivery times are provided to us by the respective delivery companies. We pass this information onto you, the customer.
Despatch times do not apply to UK public holidays.
Estimated delivery times are taken from the next available working day available for delivery. For example if an order was despatched on a working Wednesday by 3pm, the first available working day for delivery would be Thursday provided you placed your order by 3pm on the Wednesday. If the next available weekday is a UK bank holiday/public holiday then your order will be despatched on the next available working day.
Our warehouse reserves the right to upgrade the delivery method you select on your order.
Our available delivery options*
Contact us for a shipping quote.
*All delivery times are estimated unless stated.
Product Returns Note
Buykingston offers a simple, hassle-free returns policy. If for whatever
reason you are not happy with the item purchased, you can return it to us
within 14 days of receipt for a refund. This applies to items purchased
direct through Buykingston only.
Our 14 Day Returns Money Back Guarantee:
For items returned in resaleable condition, with all original packaging. If
an item has been opened for inspection but shows signs of use beyond that, a
deduction may apply to reflect the reduced value — see our full
Terms & Conditions
(Section 12) for details.
Some items are excluded from our money-back guarantee unless they have developed a fault. These include:
- Headphones
- Earphones
- Custom made and designed products, such as flash memory products with
custom logos on them, e.g. USB flash drives and memory cards with your own
logo
Returns FAQs
What is your returns criteria?
14 days from date of receipt, or expected date of receipt on non-tracked
items.
How do I go about returning my order?
Please contact us
via our contact page with your order number. We will provide you with an RMA
number and return instructions, including your return deadline and whether a
freepost label applies to your order.
Do I need to contact you before returning my order?
Yes, to obtain an RMA number before sending anything back.
Does my item have to include its original packaging?
Yes, to qualify for our 14 day money-back guarantee. For faulty items, we
understand you may no longer have the original packaging.
Who pays for return postage?
If your item is faulty, damaged, or not as described, we cover reasonable
return postage, or provide a freepost label where available. If you are
returning an item for another reason (including simply changing your mind),
you are responsible for return postage unless we have expressly confirmed a
freepost label in your RMA email — we recommend using a tracked and
insured service for items of significant value.
Who deals with the warranty on a faulty item?
We will. In some circumstances we may ask you to contact the manufacturer
directly for assistance.
Please ensure you have read and comply in full with Sections 11–13 of our Terms & Conditions.