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Green micro-ATX board with black LGA 1150 socket and silver heatsinks

MSI

MSI B85M-E45 Intel B85 motherboard LGA 1150 DDR3 32GB

SKU CH-J2RN-ZSRV1

Micro-ATX board for LGA 1150 CPUs with dual-channel DDR3 up to 32 GB, one PCIe 3.0 x16 slot, six SATA ports, 7.1 audio and gigabit LAN

  • Processor4th Generation Intel Core i7/Core i5/Core i3/Pentium/Celeron
  • ChipsetIntel B85
  • CPU socketLGA 1150
  • Supported memorySupports dual-channel DDR3 1600/1333/1066 MHz memory
  • Max supported RAM32 GB
  • PCI slots1 PCIe 3.0 x16 slot 2 PCIe 2.0 x1 slots 1 PCI slot
  • Supports 4th Generation Intel Core processors with LGA 1150 socket
  • Dual-channel DDR3 memory up to 32GB at 1600/1333/1066MHz
  • PCIe 3.0 x16 slot plus two PCIe 2.0 x1 slots and one PCI slot
  • Four SATA III and two SATA II ports with RAID support
  • Realtek ALC887 7.1-channel audio and Realtek 8111G Gigabit LAN

Socket LGA 1150 micro-ATX board

The MSI B85M-E45 is a micro-ATX motherboard built around the Intel B85 chipset for LGA 1150 processors. It accepts 4th generation Core i7, i5, i3, Pentium and Celeron CPUs. The board provides dual-channel DDR3 memory support up to 32 GB. It suits compact builds that need legacy CPU compatibility.

Bundled I/O shield and single SATA cable

The retail package adds a chassis I/O back panel and one SATA cable to the bare board. A CMOS battery is also supplied. No further cables, brackets or driver media are included. The back panel covers the board's rear ports, while the single cable enables one SATA device connection immediately.

PCIe 3.0 x16 slot and SATA interface limits

The lone PCIe 3.0 x16 slot carries the graphics card at full bandwidth, while two PCIe 2.0 x1 slots and one PCI slot handle add-in cards at lower speeds. Six SATA ports are available: four SATA III and two SATA II. The integrated Realtek 8111G LAN controller tops out at 1000 Mbps.

How it compares

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

Price $37.99
Cheaper than about 91% of the 2,965 comparable items (median $97.99).

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Specifications

Product
Brand nameMSI
Product lineMSI B85M-E45
Model nameMSI B85M-E45
Processor
Processor4th Generation Intel Core i7/Core i5/Core i3/Pentium/Celeron processors with Socket 1150 architecture
CPU socketLGA 1150
ChipsetIntel B85
Memory
Supported memorySupports dual-channel DDR3 1600/1333/1066 MHz memory
Max supported RAM32 GB
Storage
SATA and RAID support4XSATA III interface, 2xSATA II interface
Audio & video
Audio chipChipset integrated by Realtek ALC887–7.1-channel high-quality sound effects
Connectivity
Ethernet controller1 PCI Express network port supports 10/100/1000 Fast Ethernet provided by Realtek 8111G
Ports & slots
PCI slots1 PCIe 3.0 x16 slot
2 PCIe 2.0 x1 slots
1 PCI slot
Onboard USB headers4 USB 3.0 ports (2 on the backplane, 2 built-in)
8 USB 2.0 ports (4 on the backplane, 4 built-in)

Questions about this item

Will the CMOS battery on the MSI B85M-E45 need replacing and how often?

The board ships with a CMOS battery included; typical coin cells last several years before the system clock drifts and the battery should be swapped then.

Which component hits its limit first when the B85M-E45 runs at full load for hours?

The four DDR3 slots max out at 32 GB total, so memory capacity is the first hard ceiling you reach under sustained heavy workloads.

How loud and hot does the B85M-E45 get when it runs all day with all 4 USB 3.0 and 8 USB 2.0 ports active?

The board has no active cooling of its own; noise and heat depend on the CPU cooler and case airflow you pair with it.

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