Overview
Choosing the right industrial motherboard is a system architecture decision, not simply a matter of board size. ATX, Micro ATX, and Mini ITX each offer a different balance of compute support, expansion, connectivity, and integration flexibility. This guide helps OEM and ODM system designers evaluate those tradeoffs and select the form factor that best aligns with the target application.
ATX vs. Micro-ATX vs. Mini-ITX Understanding the Basics
Motherboards are available in several form factors, including ATX, Micro-ATX, Mini-ITX, as well as Single Board Computers, or SBCs, which integrate core computing components onto a compact board for embedded applications. In this article, we will focus on ATX, Micro-ATX, and Mini-ITX to explain how each form factor differs in size, expansion, connectivity, and scalability for industrial and OEM system design.
The table below provides a quick overview based on Premio’s industrial motherboard portfolio.
Read more about the difference between SoC and SBC>>
Form factor: Start With System Requirements, Not Board Size
Selecting the right motherboard form factor starts with the system requirements, not the board dimensions. A compact platform may reduce footprint, but the best choice is the one that aligns with the application’s compute, expansion, connectivity, thermal, and integration needs. Before selecting a form factor, system designers should evaluate four key design considerations.
- Size and dimensions
Does the motherboard physically fit the target chassis, and is there still enough room for cooling, storage, power supplies, and add on cards? - Expansion
How many PCIe cards, storage devices, networking interfaces, or accelerators will the system need? - Application requirements
A kiosk, machine vision system, industrial controller, and edge AI workstation may all have very different motherboard requirements. - Scalability
Can the platform support future upgrades or different OEM configurations without redesigning the entire system?
ATX, Micro-ATX, and Mini-ITX an all support high performance processors depending on their socket, chipset, power delivery, and platform architecture.
A compact Mini-ITX platform can still deliver significant compute capability. For instance, CT-XAR01 combines Intel Core Ultra 200S processors with DDR5 ECC support and PCIe Gen 5 x16 expansion within a 170 × 170 mm footprint.
Evaluate Performance at the Platform Level
Motherboard size does not directly determine CPU performance. ATX, Micro-ATX, and Mini-ITX can support similar processor classes depending on socket, chipset, power delivery, and platform architecture. What changes is how much memory, expansion, connectivity, and thermal capacity can be built around that processor.
For OEM and ODM system design, evaluate the platform based:
- CPU architecture: Processor generation, core count, and workload requirements
- Memory: Capacity, speed, and ECC support for data intensive applications
- Expansion and acceleration: PCIe availability for GPUs, NPUs, and other accelerators
- Power and thermals: Sufficient power delivery and cooling for sustained performance
The key is to choose the CPU for the workload, then select the form factor based on the system resources required around it.
How Form Factor Affects System Design
For OEM and ODM systems, this determines how much flexibility the platform has to integrate additional devices and application requirements.
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PCIe: Evaluate the required PCIe generation, number of GPUs, frame grabbers, NICs, or accelerators, as well as physical slot availability and lane allocation.
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Industrial I/O: USB, COM, GPIO, LAN, and display interfaces should match the cameras, sensors, controllers, networks, and legacy equipment used by the application. Greater onboard I/O integration can also reduce the need for additional expansion cards.
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Memory and Storage: Consider the required DIMM capacity and number of NVMe, M.2, or SATA devices. Larger form factors generally provide more room for expansion, while compact boards may rely more heavily on high-density interfaces such as M.2 and MCIO.
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Thermal and Mechanical Design: Form factors influence enclosure size, component spacing, airflow, and clearance for heatsinks, GPUs, storage, and power supplies. System designers should confirm that the chosen form factor can support the required cooling and mechanical layout.
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Future Scalability: Consider whether the platform can support future memory, storage, networking, and I/O upgrades or different OEM configurations without requiring a motherboard or enclosure redesign.
The right form factor should provide the connectivity and expansion required by the application without adding unnecessary size or system complexity.
From ATX to Mini ITX: Premio’s Industrial Motherboard Portfolio
Premio’s three industrial motherboard platforms span ATX, Micro-ATX, and Mini-ITX form factors, each designed with distinct priorities in compute, GPU/PCIe expansion, and system integration to support a wide range of OEM and ODM application requirements.
| Platform | Best for | Advantage |
| CT-AR701 | Server-class edge and on-premises AI systems requiring high bandwidth and extensive expansion | Supports data-intensive, high-bandwidth workloads with extensive expansion, networking, and system scalability |
| CT-MBL01 | Industrial automation, machine vision, and edge computing systems requiring a balance of performance and expansion | Balance of footprint, I/O, storage, and PCIe expansion |
| CT-XAR01 | Compact edge and embedded systems where space efficiency and streamlined I/O expansion are priorities | Compact integration with modern compute and essential expansion |
CT-AR701: Maximum Scalability
The CT-AR701 uses the larger ATX architecture to support systems where high-bandwidth expansion and scalability are primary requirements. Built on the AMD AM5 platform, it supports AMD EPYC™ 4005/4004 and AMD Ryzen™ 9000 Series processors with up to 170W TDP.
Key features:
- Supports EPYC™ 4005/ 4004 processors and Ryzen™ 9000
- 4x DDR5 UDIMM, up to 5600 MT/s, Max. 192GB (Non-ECC)
- 2x Intel® I210AT, 2x Broadcom 10GbE LAN
- 2x M.2 M key 2280 NVMe, 1x M.2 E key 2230
- 2x PCIe x16 Gen 5, 1x PCIe x4 (Open End), 1x PCIe x1
CT-MBL01: Balanced Expansion
The CT-MBL01 provides additional expansion while maintaining a smaller footprint than ATX. Supporting Intel® Core™ Series 2 as well as 14th, 13th, and 12th Gen Intel® Core™ processors, the platform combines multiple PCIe slots with industrial I/O, storage, and networking for scalable edge systems.
Key features:
- Supports Intel® Core™ Series 2, 14th, 13th, and 12th Gen processors
- Intel® Q670E chipset (LGA1700)
- Up to 128GB DDR5 4400 MT/s (4x UDIMM)
- Integrated COM, USB, GPIO, and dual LAN connectivity
- Quad display support (DP++)
- Dual PCIe x16 (Gen 5/Gen 4), 2x PCIe x4 (Gen 4/Gen 3)
- Triple M.2 slots: 2x M Key (NVMe PCIe x4/SATA), 1x E Key (PCIe x2/USB 2.0)
CT-XAR01: Compact Integration
The CT-XAR01 demonstrates how modern compute and high-speed connectivity can be integrated into a compact 170 × 170 mm platform. Powered by Intel® Core™ Ultra Series 2 processors and the Intel® W880 chipset, it is designed for applications that need high compute density without moving to a larger motherboard.
Key Features:
- Intel® Core™ Ultra 200S Series (Arrow Lake-S) processors
- Intel W880 chipset
- Up to 96GB DDR5 5600 MT/s ECC or non-ECC memory
- 1x PCIe Gen 5 x16 slot for high-performance expansion
- MCIO high-speed PCIe 4-lanes for scalability
- Quad independent displays via 2x DisplayPort, HDMI, and LVDS/eDP
Conclusion
For OEM and ODM designers, the process should begin with the workload: define the required compute, I/O, storage, networking, thermal, and expansion needs, then select the form factor that delivers the right balance for the target application.
The right form factor is the one that delivers the right balance of compute, expansion, I/O, storage, networking, and system integration for the target application.