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Micro ATX motherboard with dark heatsinks and CPU cooler beside it

ASUS

ASUS TUF GAMING B550M-E WIFI AMD motherboard with Ryzen 7 5800X3D

SKU CH-BS39-7GF9V

Micro ATX AM4 board with Wi-Fi, dual M.2 and 128 GB DDR4 paired with an 8-core 3.4 GHz 105 W CPU featuring 96 MB L3 cache

  • CPU TypeRyzen 5000 Series
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory Standard4866(OC)/4800(OC)/4600(OC)/4466(OC)/4400(OC)/4333(OC)/4266(O
  • Maximum Memory Supported128GB
  • Channel SupportedDual Channel
  • 8-core 3.4 GHz Ryzen 7 5800X3D delivers high frame rates in CPU-bound games
  • 96 MB L3 cache cuts latency for smoother 1% lows in competitive titles
  • B550 chipset with PCIe 4.0 x16 slot unlocks full GPU bandwidth on AM4
  • Four DDR4 slots support up to 128 GB for heavy multitasking and content creation
  • Micro-ATX form factor fits compact cases while keeping dual M.2 and four SATA ports

AM4 socket bundle for Ryzen 5000 builds

This motherboard and processor pair targets AM4 system builders who want an eight-core CPU without a discrete graphics requirement. The Micro ATX board fits compact cases while the 5800X3D delivers 8 cores and 16 threads at a 105 W TDP. Windows 10 and 11 are both supported.

96 MB L3 cache for gaming workloads

The processor includes 96 MB of L3 cache, a figure that directly affects frame rates in cache-sensitive titles. Four DDR4 slots accept up to 128 GB in dual-channel mode at speeds up to 4866 MHz when overclocked. The B550 chipset provides one PCIe 4.0 x16 slot and two PCIe 3.0 x1 slots.

105 W TDP under sustained all-core load

The 5800X3D maintains its 3.4 GHz base clock across all eight cores within the rated 105 W envelope. The board supplies power through an 8-pin EPS connector and a 24-pin ATX connector. Two M.2 slots and four SATA 6 Gb/s ports handle storage without throttling the CPU.

Highlights

  • 8-core 3.4 GHz Ryzen 7 5800X3D delivers high frame rates in CPU-bound games
  • 96 MB L3 cache cuts latency for smoother 1% lows in competitive titles
  • B550 chipset with PCIe 4.0 x16 slot unlocks full GPU bandwidth on AM4
  • Four DDR4 slots support up to 128 GB for heavy multitasking and content creation
  • Micro-ATX form factor fits compact cases while keeping dual M.2 and four SATA ports

Specifications

BrandASUS
ModelTUF GAMING B550M-E WIFI
CPU TypeRyzen 5000 Series
ChipsetAMD B550
Number of Memory Slots4x288pin (DDR4)
Memory Standard4866(OC)/4800(OC)/4600(OC)/4466(OC)/4400(OC)/4333(OC)/4266(OC)/4200(OC)/4133(OC)/4000(OC)/3866(OC)/3733(OC)/3600(OC)/3466(OC)/3400(OC)/3333(OC)/3200/3000/2933/2800/2666/2400/2133 MHz, Un-buffered Memory*
* ECC memory (ECC mode) support varies by CPU.
Maximum Memory Supported128GB
Channel SupportedDual Channel
PCI Express 4.0 x16AMD Ryzen 5000 Series/ 3000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x16 mode)
PCI Express 3.0 x16AMD Ryzen 5000 G-Series/ 4000 G-Series Desktop Processors
1 x PCIe 3.0 x16 slot (supports x16 mode)
PCI Express x1AMD B550 Chipset
2 x PCIe 3.0 x1 slots
Serial ATA (SATA)4 x SATA 6Gb/s
Form FactorMicro ATX

Questions about this item

How does the 96 MB L3 cache on the Ryzen 7 5800X3D behave once the processor is installed in this board?

The 96 MB L3 cache on the Ryzen 7 5800X3D operates at full speed as soon as the CPU is seated in the Socket AM4 slot; no extra configuration is required on the TUF GAMING B550M-E WIFI.

What does the PCI Express 4.0 x16 slot actually deliver when a Ryzen 5000 series chip is used?

With a Ryzen 5000 series processor the single PCIe 4.0 x16 slot runs at full x16 electrical width, giving a graphics card the full 4.0 bandwidth the chipset provides.

What physical space and power connections does the Micro ATX board need inside a case?

The micro ATX form factor fits standard micro ATX or larger cases, requires a 24-pin ATX power connector and an 8-pin EPS connector, and mounts on the usual AM4 standoff pattern.

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