NOT a Xeon. All Pentium 3 Xeon CPUs were packaged in a SECC cartridge and typically used an Intel 840 chipset.
It sounds like he has a bog-standard Tualatin FC-PGA-2 processor, which were common in blade servers. They typically don't work in standard Pentium 3 PPGA/FC-PGA socket 370 compatible boards. They are nice processors, but a bit wasted in a board with only 512 MB of Ram. I'd look for a dual CPU ATX mother board on Ebay out of a 1U server or something with an AGP slot and support for ~2GB of ram.
It sounds like he has a bog-standard Tualatin FC-PGA-2 processor, which were common in blade servers. They typically don't work in standard Pentium 3 PPGA/FC-PGA socket 370 compatible boards. They are nice processors, but a bit wasted in a board with only 512 MB of Ram. I'd look for a dual CPU ATX mother board on Ebay out of a 1U server or something with an AGP slot and support for ~2GB of ram.