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Green rectangular Micro ATX motherboard with silver sockets and black heatsinks

MSI

MSI B85M-P33 LGA 1150 B85 DDR3 32GB Micro ATX Intel motherboard

SKU CH-W8SB-Z61DK

Micro-ATX board for LGA 1150 CPUs with dual-channel DDR3 up to 32 GB, one PCIe 3.0 x16 slot, two SATA III and two SATA II ports, Realtek ALC887 8-channel audio, Gigabit LAN.

  • CPU Socket TypeLGA 1150
  • CPU Type4th Generation Intel Core i7/Core i5/Core i3/Pentium/Celeron
  • ChipsetIntel B85
  • Memory StandardSupports dual-channel DDR3 1600/1333/1066MHz memory
  • Maximum Memory Supported32GB
  • PCI Slots1 PCIe 3.0 x16 slot 1 PCIe 2.0 x1 slot
  • Supports 4th Gen Intel Core processors via LGA 1150 socket
  • Dual-channel DDR3 memory up to 32GB at 1600/1333/1066MHz
  • PCIe 3.0 x16 and PCIe 2.0 x1 slots for expansion
  • Realtek ALC887 8-channel audio with Azalia 1.0 compliance
  • Gigabit LAN via Realtek 8111G plus 2 USB 3.0 and 8 USB 2.0 ports

Socket 1150 Micro ATX board

This Micro ATX motherboard uses the Intel B85 chipset and an LGA 1150 socket for 4th generation Intel Core i7, i5, i3, Pentium and Celeron processors. It supports dual-channel DDR3 memory up to 32 GB at speeds of 1600, 1333 and 1066 MHz. The board provides one PCIe 3.0 x16 slot and one PCIe 2.0 x1 slot for expansion cards.

Check CPU cooler clearance and power phases

Verify that your CPU cooler fits the Micro ATX layout around the LGA 1150 socket and that your power supply delivers the required 24-pin ATX and 4-pin CPU connectors. Confirm the case has mounting points for a Micro ATX board and that the rear I/O shield matches the supplied back panel. Ensure any existing DDR3 modules match the supported speeds.

Sustained load behaviour

The Realtek 8111G LAN controller maintains 10/100/1000 Fast Ethernet throughput during long transfers. The Realtek ALC887 audio chip delivers 8-channel output compliant with Azalia 1.0 specifications without degradation over time. Two SATA III and two SATA II ports keep consistent data rates for storage arrays under continuous use. Onboard USB 3.0 and USB 2.0 ports sustain rated bandwidth during extended sessions.

Highlights

  • Supports 4th Gen Intel Core processors via LGA 1150 socket
  • Dual-channel DDR3 memory up to 32GB at 1600/1333/1066MHz
  • PCIe 3.0 x16 and PCIe 2.0 x1 slots for expansion
  • Realtek ALC887 8-channel audio with Azalia 1.0 compliance
  • Gigabit LAN via Realtek 8111G plus 2 USB 3.0 and 8 USB 2.0 ports

Specifications

BrandMSI
SeriesMSI B85M-P33
ModelMSI B85M-P33
CPU Socket TypeLGA 1150
CPU Type4th Generation Intel Core i7/Core i5/Core i3/Pentium/Celeron processors with Socket 1150 architecture
ChipsetIntel B85
Memory StandardSupports dual-channel DDR3 1600/1333/1066MHz memory
Maximum Memory Supported32GB
PCI Slots1 PCIe 3.0 x16 slot
1 PCIe 2.0 x1 slot
SATA RAID2XSATA III interface, 2xSATA II interface
Audio ChipsetRealtek ALC887 Audio Chip
- Supports 8-channel audio output
- Compliant with Azalia 1.0 specifications
LAN Chipset1 PCI Express network port supports 10/100/1000 Fast Ethernet provided by Realtek 8111G
Onboard USB2 USB 3.0 ports located on the backplane
8 USB 2.0 ports (4 on the backplane, 4 built-in)

Questions about this item

Does the board come with a back-panel shield and a SATA cable, or do I need to source them?

The package includes a chassis I/O back panel and one SATA cable along with the motherboard and CMOS battery.

Should I pick DDR3 1600 or 1333 modules for the 32 GB limit?

Both speeds are supported in dual-channel mode; 1600 MHz modules run at their rated speed while 1333 MHz modules run at theirs, so either reaches the 32 GB maximum.

What does the single PCIe 3.0 x16 slot mean for a modern graphics card?

A graphics card will operate at PCIe 3.0 x16 bandwidth, which is the full electrical width the board provides for that slot.

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