mATX vs ATX
mATX vs ATX
I’m comparing various budget AM4 motherboards. Most appear to be MATX models that feel outdated or not suitable for the future. Also, checking if they offer enough space for expansion is important.
That's exactly what I always say. I prefer buying ATX units because I understand they offer better expansion options compared to mATX. If my goal was just a regular desktop and I didn’t plan to use it as a server later, I could have gone with mATX since I didn’t need much extra space.
The expandability of ATX boards is often underestimated when compared to mATX options. On the B550 platform, I’ve explored it extensively—featuring 24 lanes in total, including 16x Gen 4 and 4x Gen 4 M.2 NVMe drives. Many boards tend to consolidate everything into a single lane path for the CPU, which is typically reserved for Wi-Fi cards or as a dedicated slot. There are usually 8 Gen 3 lanes from the chipset, but most motherboards use only 4 lanes for the M.2 SSD, often connected via a standard 1x slot.
For ASUS ATX boards, you generally have either four 1x slots or four 4x slots. However, on their mATX versions, they stick to a straightforward 4x configuration. When using a WiFi card, the lane count drops to two, depending on whether you use a single lane for the chipset or enable the second M.2 slot.
ASRock offers more flexibility with chipset SSDs and can share bandwidth from multiple Gen 3 lanes, though most configurations limit you to four lanes overall. The B550 provides a balanced setup, while the Z490 follows a similar lane structure but comes with clear guidelines in its manual about slot limitations.
On platforms like X570 and HEDT, you find more lanes available, making ATX boards ideal for those needing greater expansion. But if space is tight, mATX boards often suffice—especially when you’re okay with fewer lanes or disable the second M.2.
For most users, ASUS remains a top choice due to its comprehensive slot options and reliable performance. Others may find mATX boards more suitable depending on their specific needs and available space.