HP 5187-6155 System Board (Motherboard) Socket 478 Giovani Gl6. This refurbished desktop motherboard features Socket 478 processor compatibility, designed for HP Giovani GL6 systems. The board supports Intel Pentium 4 and Celeron processors, with integrated chipset and legacy I/O connectivity including PCI and ISA slots typical of early 2000s desktop platforms. Intended for legacy system builds, replacements, and refurbishment projects requiring Socket 478-based hardware. HP Part Number: 5187-6155. This unit has been tested and guaranteed, available via quote from G5 Network Group.