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Green Micro ATX motherboard with black sockets and silver heatsinks

MSI

MSI A55M-P33 AMD motherboard Socket FM1 DDR3 16GB Micro ATX

SKU CH-8V09-HRPC2

Micro ATX board for Socket FM1 APUs with dual-channel DDR3 up to 16GB 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 1 PCIE x1 slot 1 PCI slot
  • Socket FM1 supports AMD Llano APU CPUs
  • AMD A55 chipset provides stable platform foundation
  • Dual-channel DDR3 up to 1600MHz boosts memory bandwidth
  • 16GB maximum RAM capacity handles demanding workloads
  • Realtek ALC887 delivers 8-channel high-definition audio

Socket FM1 AMD A55 Micro-ATX motherboard

The MSI A55M-P33 is a Micro-ATX board built around the AMD A55 chipset for Socket FM1 processors such as Llano APUs. It supports dual-channel DDR3 memory up to 16 GB at 1600, 1333 or 1066 MHz. Expansion includes one PCI Express x16 slot, one PCI Express x1 slot and one legacy PCI slot.

For FM1 APU builds needing basic I/O

This board suits a low-cost system using an FM1 APU with integrated graphics and modest storage needs. Six SATA 3 Gb/s ports and six rear USB 2.0 ports handle drives and peripherals. Realtek 8-channel audio and a gigabit LAN controller cover media and networking. Builders needing M.2 slots, USB 3.0 or newer CPU sockets should choose a different platform.

Six SATA 3 Gb/s ports

The AMD A55 chipset provides six SATA 3 Gb/s connectors for hard drives or SATA SSDs. No 6 Gb/s SATA ports are present on this chipset. Check that your storage plan fits six drives before ordering.

How it compares

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

Price $35.99
Cheaper than about 95% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Product lineMSI A55M-P33
Model nameMSI A55M-P33
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 ALC887 Chip
- Supports 8-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
1 PCIE x1 slot
1 PCI slot
Onboard USB headers6 USB 2.0 ports (backplane)

Questions about this item

Should I choose the 16GB maximum memory or a lower capacity for this board?

The board supports up to 16GB of DDR3 across two channels, so you can install 4GB, 8GB or 16GB depending on your workload and budget.

What does the 1600MHz DDR3 rating mean once the board is running?

It indicates the highest memory clock the board can officially run; installed DDR3 modules will operate at up to 1600MHz in dual-channel mode.

What does the SATA II interface cap in practice?

The six SATA II ports run at the SATA 3 Gb/s signalling rate, limiting maximum throughput to that standard.

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