ATX vs EATX Motherboards: Size and Expansion

What are ATX and EATX motherboards?

ATX and EATX are two motherboard form factors that define the physical dimensions and mounting hole layout of the board. The form factor determines how the motherboard fits into a case and what kind of expansion slots and connectors are available. ATX is the most common form factor for gaming PCs, offering a standard size that fits in a wide range of mid-tower and full-tower cases. EATX, short for Extended ATX, is a larger variant that provides additional board space for more components and expansion slots.

The size difference is the primary distinction: EATX boards are wider and longer than ATX boards. This extra space allows manufacturers to include more PCIe slots, additional M.2 slots, and more robust power delivery components. However, the larger size also means that EATX boards require a case that is specifically designed to accommodate them. Most mid-tower cases support ATX, but EATX typically needs a full-tower case or a case that explicitly lists EATX compatibility.

For gaming, the choice between ATX and EATX often comes down to how many expansion cards and storage drives you plan to install. A standard ATX board usually has enough PCIe slots for a graphics card and a few additional cards, such as a capture card or a Wi-Fi adapter. EATX boards offer more slots, which can be useful if you need multiple graphics cards, high-end audio cards, or other add-in cards simultaneously. For a closer look at different motherboard sizes, see ATX vs Micro-ATX vs Mini-ITX.

Expansion differences between ATX and EATX

The main expansion difference between ATX and EATX is the number of PCIe slots and M.2 slots available. ATX boards typically have three to four PCIe x16 slots and one to three M.2 slots, which is sufficient for most gaming setups. EATX boards often have four to six PCIe slots and up to five M.2 slots, providing more room for multiple graphics cards, capture cards, and high-speed NVMe SSDs.

More M.2 slots are particularly valuable for gamers who maintain a large library of games and want fast load times. With additional M.2 slots, you can install multiple NVMe SSDs without needing to use slower SATA drives or add-in adapter cards. This can help keep your game library organized and reduce the need for external storage solutions.

EATX boards also tend to have more USB headers, fan headers, and RGB headers, which can simplify cable management and allow for more customization. If you plan to build a system with many case fans, custom water cooling, or extensive RGB lighting, the extra headers on an EATX board can be beneficial. However, for a typical gaming PC with a single graphics card and a few drives, ATX provides ample expansion options.

Case compatibility and physical fit

The physical size of the motherboard dictates the minimum case size you need. ATX boards fit in most mid-tower and full-tower cases, which are the most common form factors for gaming PCs. EATX boards, being larger, require cases that are specifically designed to support the extended size. Many full-tower cases support both ATX and EATX, but some mid-tower cases may not have enough clearance for the extra width and length.

When choosing a case, check the specifications to see if it lists EATX compatibility. Some cases have removable drive cages or adjustable mounting points that allow for EATX boards, while others are strictly limited to ATX and smaller. It is also important to consider the space for cable management and airflow, as a larger board can make routing cables more challenging in a cramped case.

For most gamers, an ATX motherboard in a mid-tower case offers a good balance of expansion and ease of build. If you need the extra expansion of EATX, you will likely need a full-tower case, which provides more room for components and airflow. This can be beneficial for high-end builds with multiple graphics cards or extensive cooling solutions.

Choosing the right size for your gaming style

The choice between ATX and EATX should be based on your current and future expansion needs. If you play at 1440p with a single graphics card and a few drives, an ATX motherboard is likely sufficient. It offers enough PCIe slots for a graphics card and other add-in cards, and it fits in a wide range of cases. For most gamers, ATX is the practical choice.

If you plan to use multiple graphics cards, install several M.2 SSDs, or add many expansion cards, an EATX motherboard provides the extra space and slots you need. This is more common in high-end builds for 4K gaming or content creation, where multiple GPUs and fast storage are beneficial. However, remember that EATX requires a larger case, which can affect the overall size and weight of your system.

Consider your upgrade path as well. If you think you might add more storage or expansion cards in the future, an EATX board gives you more headroom. But if you prefer a compact build or are working with a limited desk space, ATX in a mid-tower case is a more manageable option.

What to pick for your play

For competitive gaming at high refresh rates, an ATX motherboard with a single graphics card is more than enough. The focus should be on the CPU and GPU, not the motherboard size. For immersive single-player games that benefit from fast storage, an ATX board with multiple M.2 slots can keep your game library on NVMe SSDs. If you are building a streaming rig, an ATX board with a capture card slot and good connectivity is ideal.

EATX is worth considering if you are building a top-tier system with multiple graphics cards or need the maximum number of M.2 slots. This is often the case for 4K gaming or content creation, where storage speed and capacity are critical. However, the larger case required for EATX may not be necessary for most gaming setups.

Ultimately, the decision comes down to your expansion needs and case preferences. Both ATX and EATX can deliver excellent gaming performance; the difference is in how much room you have for additional components. Choose ATX for a balanced build that fits most cases, or choose EATX if you need the extra expansion and are prepared for a larger case.

What to pick for your play

Questions

Is EATX better than ATX for gaming?

EATX is not inherently better for gaming; it simply offers more expansion slots and physical space. For most gaming setups, ATX provides sufficient expansion and is more compatible with standard cases. EATX is beneficial if you need multiple graphics cards or many M.2 drives.

Can an EATX motherboard fit in a mid-tower case?

Most mid-tower cases do not support EATX motherboards due to size constraints. You will need a full-tower case or a case that explicitly lists EATX compatibility. Always check the case specifications before purchasing.

What are the advantages of more M.2 slots on an EATX board?

More M.2 slots allow you to install multiple NVMe SSDs directly on the motherboard, providing fast storage for a large game library without needing SATA drives or adapter cards. This can improve load times and simplify storage management.

Does motherboard size affect gaming performance?

Motherboard size does not directly affect gaming performance. Performance is determined by the CPU, GPU, and memory. The size only affects the number of expansion slots and the case compatibility, which can influence your ability to add components.