Hardware Spec Index

Zephyra MB-8390 Prime B550 Micro-ATX Wi-Fi 6E Motherboard

Motherboards · Zephyra · SKU MB8390-PRIME · Released 2021 · Updated 2026-10-25

Key facts

Benchmark index4,332 (Motherboards scale)
Category rank#2,701
Street price$329
Power40 W
Performance per dollar13.17
Released2021

Specifications

BrandZephyra
ModelZephyra MB-8390 Prime
SocketAM4
ChipsetB550
Form factorMicro-ATX
Memory2× DDR4 DIMM, up to 64 GB
Max memory speedDDR4-4800+ (OC)
Primary x16 slotPCIe 4.0 x16
M.2 slots5 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
VRM19+2+1 phases, 90 A stages
BIOSDual UEFI, BIOS flashback button

Related guides

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Cite this page: Hardware Spec Index, “Zephyra MB-8390 Prime B550 Micro-ATX Wi-Fi 6E Motherboard”, https://vextor7.com/item/516547 (accessed 2026-10-25).