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Green rectangular ATX motherboard with silver sockets and black slots

MSI

MSI 870S-G46(FX) AMD 870 motherboard 32GB DDR3 AM3+

SKU CH-SXW3-XAJ20

An AM3+ board with AMD 870 chipset supporting dual-channel DDR3 up to 1600 MHz and 32 GB maximum memory

  • ProcessorSupports 64-bit AMD FX, Phenom II X6/X4/X3/X2, Athlon II X4/
  • ChipsetAMD 870
  • CPU socketSocket AM3+
  • Supported memorySupports dual-channel DDR3 1600 (overclocking)/1333/1066/800
  • Max supported RAM32 GB
  • PCI slots2 PCI Express x16 slots - 1, slot (PCI_E2) supports PCIE 2.0
  • Supports AMD FX and Phenom II processors with Socket AM3+
  • Dual-channel DDR3 up to 1600 MHz for responsive multitasking
  • 32 GB maximum memory capacity handles heavy workloads
  • Six SATA III ports give ample storage connectivity
  • Realtek ALC892 provides eight-channel audio output

Socket AM3+ DDR3 platform

The MSI 870S-G46(FX) is an ATX motherboard built around the AMD 870 chipset for Socket AM3+ processors. It accepts 64-bit AMD FX, Phenom II, Athlon II and Sempron CPUs and provides four DDR3 slots supporting dual-channel operation up to 32GB at 1600MHz via overclocking. The board targets users maintaining or upgrading existing AM3+ systems.

Suited for AM3+ upgrades, not new builds

This board fits builders replacing a failed motherboard in a working AM3+ machine or assembling a budget system from spare DDR3 memory and a compatible CPU. It offers six SATA ports, two PCI Express x16 slots — one at x16 and one at x4 — plus three legacy PCI slots for older expansion cards. Users needing USB 3.0, M.2 slots or modern CPU sockets should select a current-platform board instead.

32GB DDR3 ceiling

The maximum supported memory is 32GB across four DDR3 slots running at 1600, 1333, 1066 or 800MHz. That limit is fixed by the chipset and cannot be exceeded, so any build requiring more RAM must move to a newer platform.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $49.99
Cheaper than about 92% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Product lineMSI 870S-G46(FX)
Model nameMSI 870S-G46(FX)
Processor
ProcessorSupports 64-bit AMD FX, Phenom II X6/X4/X3/X2, Athlon II X4/X3/X2 and Sempron processors
CPU socketSocket AM3+
ChipsetAMD 870
Memory
Supported memorySupports dual-channel DDR3 1600 (overclocking)/1333/1066/800 MHz memory
Max supported RAM32 GB
Storage
SATA and RAID support6XSATA III interface
Audio & video
Audio chipRealtek ALC892 Chip
- Support Blu-ray sound output
- Supports 8-channel sound effects detected by intelligent sound interface
Compatible with Azalia 1.0 specifications
Connectivity
Ethernet controllerRealtek PCI-E GbLAN Controller 8111DL Chip
- Integrate Fast Ethernet MAC and PHY into a single chip
Supports 10Mb/s, 100Mb/s and 1000Mb/s
Compliant with PCI-Express bus specification v1.0a.
Ports & slots
PCI slots2 PCI Express x16 slots
- 1, slot (PCI_E2) supports PCIE 2.0 × 16 speed execution
- 1, slot (PCI_E3) supports PCIE 2.0 x4 speed execution
1 PCI Express x1 slot
3 PCI slots, supporting 3.3v/5v PCI main bus interface
Onboard USB headers8 USB 2.0 ports (backplane)

Questions about this item

What PCI Express generation do the x16 slots on the MSI 870S-G46(FX) run at?

One x16 slot operates at PCI Express 2.0 x16 speed, the second at PCI Express 2.0 x4 speed.

What size case and power connectors does the MSI 870S-G46(FX) require?

The board uses standard ATX dimensions and fits any ATX chassis with matching standoff holes and an I/O shield cut-out.

How is the MSI 870S-G46(FX) installed, and which step is often missed?

Mount the board on standoffs, attach the supplied I/O shield, connect the 24-pin and 4/8-pin CPU power cables, then install DDR3 modules in matched pairs for dual-channel operation.

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