M.2 PCIe 5.0 SSDs Set to Increase to 25 mm in Width, Might Not Fit Older Motherboards

NVMe SSDs based on the M.2 form factor come in several different lengths today, ranging from 30 to 110 mm, although the 30 mm drives are rare and the 110 mm drives have so far been reserved for the server space. However, they’ve all had one thing in common, the 22 mm width, as otherwise there might be issues in terms of fitting the drives, especially in notebooks. However, it appears that the PCI-SIG snuck in a wider, 25 mm option for M.2 SDDs at the end of 2020, but seemingly forgot to mention it to anyone. The only reason we even noticed, was because Gigabyte listed its upcoming X670 and X670E motherboards as having support for 25110 SSD’s.

An extra 3 mm in width might not sound like much, but many M.2 drives seem to be somewhat space constrained, mainly with regards to the passive components and the power regulation. It also seems like this is in preparation for PCIe 5.0 NVMe drives, where the host controller is expected to run hotter, even though it might not be as bad as initially expected. Regardless, it seems like motherboard makers are now making space for this slightly wider M.2 form factor, as well as implementing suitable cooling solutions to match. Whether we’ll see drives using this slightly wider form factor or not, is still up in the air and one reason why the SSD manufacturers might choose not to go wider, is because new drives might not fit in older motherboards and laptops, if the clearance is too small.