Hardware Spec Index

Kyndral MB-3999 Ultra B550 ATX Wi-Fi 6E Motherboard

Motherboards · Kyndral · SKU MB3999-ULTRA · Released 2021 · Updated 2026-10-22

Key facts

Benchmark index4,143 (Motherboards scale)
Category rank#6,503
Street price$299
Power37 W
Performance per dollar13.86
Released2021

Specifications

BrandKyndral
ModelKyndral MB-3999 Ultra
SocketAM4
ChipsetB550
Form factorATX
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 6E (802.11ax, 6 GHz) + Bluetooth 5.3
OverclockingCPU + memory
VRM18+2+1 phases, 90 A stages
BIOSDual UEFI, BIOS flashback button

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Cite this page: Hardware Spec Index, “Kyndral MB-3999 Ultra B550 ATX Wi-Fi 6E Motherboard”, https://vextor7.com/item/5964074 (accessed 2026-10-22).