D865PERL looks like it was built for a Pentium 4 in 2003. Its not like Intel is saying the board wont continue to work, just no bios updates. How often do you need to update the bios on a 16 year old system?
[1] Gigabyte used to mark BIOS updates as "beta" when it's past their time (in 2012 Gigabyte terms: a year) to provide less warranty & support in case something goes wrong. They're as stable as the main versions.