MSI B75A-G43 B75 LGA 1155 DDR3 32GB ATX Intel motherboard

LGA 1155 DDR3 ATX motherboard

The MSI B75A-G43 uses the Intel B75 chipset and an LGA 1155 socket for third-generation Core i7, i5, i3, Pentium and Celeron processors. It supports up to 32GB of dual-channel DDR3 memory across four slots. The ATX form factor provides three PCIe x16 physical slots and two PCIe x1 slots for expansion cards. Onboard audio uses the Realtek ALC892 codec with 8.1-channel output.

PCIe 3.0 x16 primary slot

The top PCIe slot runs at PCIe 3.0 x16 electrical speed and is the single specification that determines graphics-card bandwidth. A second x16-sized slot operates at PCIe 2.0 x16, while a third x16-sized slot is limited to PCIe 2.0 x4. Two additional x1 slots and six SATA ports (one SATA III, five SATA II) complete the I/O layout. Two USB 3.0 rear ports and one internal USB 3.0 header come from the chipset.

Sustained load behaviour

The Realtek 8111E Gigabit LAN controller handles continuous network traffic without a dedicated offload engine. The B75 chipset manages steady USB 3.0 and SATA throughput within its rated lane allocation. Voltage-regulation components cool passively, so case airflow determines thermal headroom during long compute or storage sessions. Audio and networking share the PCIe 2.0 general-purpose lanes.