Amazon.com: Genuine DELL WG261 Motherboard For the Dimension 5150 / E510 / 5100 Small Mini Tower Systems Replaces Dell Part Numbers: RD203, KF623, WG261, J8885 : Electronics
Dell Dimension 5150/E510 - iFixit
Getting Dell Dimension 5150 to upgrade to Windows 10: "there are no supported networking devices" - Dell Community