Desktop Motherboards & System Boards

Exact-model OEM replacement boards for Dell and HP desktops, plus socket-matched ATX/Micro-ATX boards for custom builds

About Desktop Motherboards

A desktop motherboard replacement has to clear three separate compatibility checks — CPU socket, form factor, and (for OEM towers) whether the board is a proprietary fit for that exact chassis. We stock Dell OptiPlex and HP Compaq/Pavilion OEM system boards, where the replacement must exactly match the original part number because Dell and HP proprietary boards are not universal ATX designs, alongside generic ATX and Micro-ATX boards (Intel, MSI, and other brands) for custom and workstation builds.

What's in Stock

Dell OptiPlex system boards — exact-model replacements identified by Dell part number, matched to the specific OptiPlex generation
HP Compaq / Pavilion desktop boards — including all-in-one system boards (e.g. iMac-style AIO logic boards) and mini-tower boards
Generic ATX & Micro-ATX boards — socket-identified (LGA 775, LGA 1155, AM2, AM3, etc.) for custom builds or non-OEM upgrades
"Without CPU / without tray" listings — many OEM boards are sold bare; confirm whether your listing includes a processor before ordering

Proprietary OEM boards from Dell and HP are not interchangeable with generic ATX boards, and even within one brand, board revisions differ by exact model and generation. Send us your Dell service tag or HP model/product number and we will match the exact board before you order.

Featured Desktop Motherboards Products

Browse all 3,866 Desktop Motherboards SKUs.

Frequently Asked Questions

Will a generic ATX motherboard fit my Dell OptiPlex case?

Not always — many OptiPlex towers use standard ATX/Micro-ATX form factors but proprietary front-panel headers, power connectors, or mounting points that only the original Dell board uses correctly. For a like-for-like repair, the Dell OEM board is the safe choice; a generic ATX board is better suited to a build in a standard aftermarket case.

What does "System Board without CPU" mean?

It means the listing is the bare motherboard only — no processor is included. You will need to reuse your existing CPU (if compatible with the board's socket) or source one separately. Always check the socket type and supported processor list before ordering a bare board.

How do I find the right replacement board for my Dell or HP desktop?

Use the service tag (Dell) or product/serial number (HP) printed on the chassis — this identifies the exact model and configuration, which determines the correct system board part number. Send us that number and we will confirm the matching board.