Hardware Spec Index

Kyndral MB-9891 Ultra B550 Micro-ATX Wi-Fi 6 Motherboard

Motherboards · Kyndral · SKU MB9891-ULTRA · Released 2020 · Updated 2026-10-19

Key facts

Benchmark index4,041 (Motherboards scale)
Category rank#17,073
Street price$289
Power38 W
Performance per dollar13.98
Released2020

Specifications

BrandKyndral
ModelKyndral MB-9891 Ultra
SocketAM4
ChipsetB550
Form factorMicro-ATX
Memory4× DDR4 DIMM, up to 128 GB
Max memory speedDDR4-4800+ (OC)
Primary x16 slotPCIe 4.0 x16
M.2 slots2 total
Rear USB-C1× USB 3.2 Gen 2 10Gbps (Type-C)
Ethernet2.5GbE
WirelessWi-Fi 6 (802.11ax) + Bluetooth 5.2
OverclockingCPU + memory
VRM18+2+1 phases, 70 A stages
BIOSDual UEFI, BIOS flashback button

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Cite this page: Hardware Spec Index, “Kyndral MB-9891 Ultra B550 Micro-ATX Wi-Fi 6 Motherboard”, https://vextor7.com/item/19889727 (accessed 2026-10-19).