Good to see BOINC floating by on HN today. I've recently been dusting off some old Mac minis that run Leopard or Snow Leopard (but no newer OS versions), and was pleasantly surprised that older BOINC versions still function!

However, not all BOINC projects support all platform architectures. This site[0] lets you see which projects support a specific architecture; only five support PowerPC Macs.

[0] http://wuprop.boinc-af.org/results/delai.py?plateforme=mac_p...