I recently retired a couple of Vias
The power cost of running this is more than the cost of replacing it.
A Katmai at 450MHz will consume ~ 90W of power. That at UK retail prices is 90£ per year.
This is the exact reason why I retired my old Via based firewalls despite them being considerably more economical (~ 24W) and moved them onto my main server to run under virtualization. They were about 12 years old (across several reincarnations from case to case) at that point. I could have left them to run and they would have clocked 15 years in a couple of years time, but it was clearly not worth it financially.