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Green rectangular Micro ATX motherboard with black slots and silver heatsinks

MSI

MSI A55-S51 AMD A55 motherboard Socket FM1 DDR3 16GB Micro ATX

SKU CH-Q7GP-6CJX0

Micro-ATX board for Socket FM1 AMD Llano APUs with dual-channel DDR3 up to 16 GB and six SATA ports

  • ProcessorAMD Llano APU, FM1
  • ChipsetAMD A55
  • CPU socketSocket FM1
  • Supported memorySupports dual-channel DDR3 1600/1333/1066 MHz memory
  • Max supported RAM16 GB
  • PCI slots1 PCI Express x16 slot 2 PCIE x1 slots 2 PCI slots
  • Supports dual-channel DDR3 up to 1600MHz for responsive memory performance
  • FM1 socket accepts AMD Llano APUs for integrated graphics capability
  • AMD A55 chipset provides 6 SATA II ports for multiple storage drives
  • Realtek ALC662 delivers six-channel audio with Azalia 1.0 compliance
  • Realtek REL8111E gigabit LAN handles 10/100/1000Mb/s wired networking

Socket FM1 platform for AMD Llano APUs

This micro-ATX motherboard uses the AMD A55 chipset and accepts Socket FM1 processors. It supports dual-channel DDR3 memory at 1600, 1333 and 1066 MHz up to 16 GB. One PCI Express x16 slot, two PCIe x1 slots and two legacy PCI slots provide expansion options. Six SATA II ports and a Realtek Gigabit LAN controller handle storage and networking.

Suited to budget desktop builds and repair projects

The board fits users who need a low-cost FM1 foundation for office work, media playback or legacy hardware compatibility. Enthusiasts requiring newer CPU sockets, faster memory standards or modern high-speed storage interfaces should consider a different platform. The micro-ATX form factor also limits space for large multi-GPU configurations.

Basic accessory kit enables immediate assembly

Included are a CMOS battery, one SATA cable and a chassis I/O back panel for case installation. No driver disc, additional cables or Wi-Fi antenna are supplied, so builders must source any extra SATA leads, operating-system media or wireless hardware separately. The minimal bundle keeps the package light but requires a few extra parts to complete a system.

How it compares

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

Price $33.99
Cheaper than about 95% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Product lineMSI A55-S51
Model nameMSI A55-S51
Processor
ProcessorAMD Llano APU, FM1
CPU socketSocket FM1
ChipsetAMD A55
Memory
Supported memorySupports dual-channel DDR3 1600/1333/1066 MHz memory
Max supported RAM16 GB
Storage
SATA and RAID support6XSATA II interface
Audio & video
Audio chipRealtek ALC662 Chip
- Supports 6-channel sound effects detected by intelligent sound interface
Compatible with Azalia 1.0 specifications
Connectivity
Ethernet controllerRealtek PCI-E GbLAN Controller REL8111E Chip
Supports 10Mb/s, 100Mb/s and 1000Mb/s
Compliant with PCI-Express bus specification v1.0a.
Ports & slots
PCI slots1 PCI Express x16 slot
2 PCIE x1 slots
2 PCI slots
Onboard USB headers4 USB 2.0 ports (backplane)

Questions about this item

Do I need to supply my own AMD Llano APU for the Socket FM1 on this MSI A55-S51?

Yes, the board requires an AMD Llano APU that fits the Socket FM1; the CPU is not included.

Will my existing PCI expansion cards fit the two PCI slots and the two PCIE x1 slots on this motherboard?

The board provides two legacy PCI slots and two PCI Express x1 slots, so most older PCI cards and modern x1 cards will install.

How can I confirm the dual-channel DDR3 memory is running at 1600MHz after I install two modules?

Enter the BIOS or use a system-information tool; it will report the memory operating in dual-channel mode at 1600MHz.

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