Gigabyte MZ33-AR1

Gigabyte MZ33-AR1 (Rev. 3.x) – Single-Socket SP5 Platform for 500W AMD EPYC 9005 with 24-DIMM Architecture

The Gigabyte MZ33-AR1 (Rev. 3.x) is an elite server motherboard designed to extract maximum performance from single-socket infrastructure. Engineered for the AMD EPYC 9005 “Turin” and 9004 “Genoa” series, this platform utilizes a deep E-ATX form factor (305W x 330D mm) to accommodate a robust power delivery system capable of sustaining cTDP levels up to 500W. It is built for extreme compute density, making it the ideal foundation for high-frequency trading, scientific simulation, and AI workloads that demand peak processor frequencies.

Unrivaled Memory Density: 24 DIMM Slots

A defining characteristic of the MZ33-AR1 is its massive memory capacity on a single CPU. It fully activates the 12-channel memory controller of the SP5 socket using a “2 DIMMs Per Channel” (2DPC) topology. With 24 DIMM slots available, system architects can populate up to 6TB of DDR5 ECC 3DS RDIMM memory. This allows memory-intensive applications, such as in-memory databases and large-scale virtualization, to run without the latency penalties associated with dual-socket communications.

Advanced MCIO Storage Ecosystem

The board replaces legacy storage headers with a high-density MCIO cabling architecture, optimizing airflow and signal integrity. It offers a total of six MCIO connectors configured for versatility:

• Gen5 Performance: Three MCIO 8i ports (PCIe Gen5 x8) are dedicated purely to high-speed NVMe or accelerator connectivity.
• Hybrid Flexibility: Two MCIO 8i ports (PCIe Gen5 x8 / SATA) allow users to connect either next-gen NVMe drives or legacy SATA arrays (BIOS configurable).
• Legacy Support: One MCIO 8i port (PCIe Gen4 x8) provides additional lanes for standard storage or auxiliary devices.

Native 10-Gigabit Networking

Connectivity is handled by the enterprise-grade Broadcom BCM57416 controller, providing dual 10GBase-T LAN ports natively. This ensures immediate integration into high-speed corporate networks and fast storage fabrics without occupying a PCIe slot.

PCIe 5.0 Expansion and Management

For external accelerators, the board provides four PCIe 5.0 x16 slots, offering full bandwidth for professional GPUs and FPGA units. System supervision is centralized via the ASPEED AST2600 BMC, enabling secure IPMI 2.0 access and KVM-over-LAN for remote “lights-out” management. A dedicated M.2 slot (PCIe Gen3 x4) is also included for reliable OS booting.

Technical Specifications Summary

• Processor Support: AMD EPYC 9005/9004 (Socket SP5) / Up to 500W cTDP
• Memory Topology: 24 DIMM Slots, 12-Channel DDR5 ECC (Up to 6TB)
• Network Interface: 2x 10GbE (Broadcom BCM57416) + Dedicated IPMI LAN
• Expansion Slots: 4x PCIe 5.0 x16 slots
• Storage I/O: 5x MCIO Gen5 (2x SATA capable), 1x MCIO Gen4, 1x M.2 Gen3
• Form Factor: E-ATX (305W x 330D mm)