When sourcing a DVR motherboard, you must prioritize the compression standard, typically H.265 or H.265+, to ensure efficient storage and bandwidth usage. Check the channel capacity (e.g., 4, 8, 16, or 32 channels) and the maximum resolution support, such as 4K (8MP) or 5MP, to match your camera requirements. Additionally, verify the storage interface, ensuring it supports SATA 3.0 with a high maximum capacity (e.g., up to 10TB per HDD) and look for Pentaplex functionality which allows simultaneous viewing, recording, playback, backup, and remote access.