Hi iClooly,
Dell XPS 410 has a four-layer, BTX-compatible board based on the Intel P965 Broadwater MCH (memory control hub) and ICH 8DH (I/O controller hub: Digital Home). This system board supports the LGA775 series of Intel processors (Cedar Mill, Presler, and Conroe). This model is compatible with SATA II drives.
E-ATX (extended ATX) means that the board is of ATX standard, but a bit larger than normal.
You may also use the below link to get more information on it:
If you have any further questions do reply to the same post.