ATX Motherboard Slot Numbering System

ATX Motherboard Slot Numbering System

Here at DuroPC, we are always trying to improve upon the customer experience. When trying to offer our support, we have found that it can be somewhat difficult to pinpoint which expansion slot that our customers are referring to. Maybe they are experiencing an issue with the third PCI express slot. But is that third from the right or third from the left? And which side is right or which side is left? Are you looking at the front of the chassis or the rear of the chassis? This conundrum brought to our attention the need for a standardized ATX motherboard slot numbering system.

While researching this topic, we came to the realization that there really is no industry standard for naming expansion slots. Different manufacturers each use their own numbering schemes. It can even vary from board to board. So to minimize all of the confusion, DuroPC has decided to develop our very own slot numbering system. We’ve even created a handy-dandy image to explain it. From the rear of the chassis, we will always start from the left, where the I/O plate is, counting up toward the right.

Although every motherboard’s layout is different, for an ATX motherboard, this count can range from 1-7, reaching a maximum of 7 slots. Other motherboard form factors can vary in the number of slots that they carry. If you are interested in a motherboard system, please review DuroPCs 4U Rackmount Motherboard, 3U Rackmount Motherboard, and Tower PC product offerings.

We are hoping that the creation of the DuroPC ATX motherboard slot numbering system will alleviate much confusion. This should help to facilitate an easier interaction when supporting our wide-customer base. As always, if you have any questions, please reach out to the DuroPC staff at 888-760-DURO. We are here to support you.