I have an ancient Atom 330 still chugging away as my Asterisk box. It's on an old Intel Mini-ITX board, the only Intel-branded motherboard I've ever had that didn't die from capacitor plague.
It's hilarious to realize that a Raspberry Pi 4 will run circles around it. The 330 can't saturate a GbE port, and even the SSD pokes along at the 1.5 Gbps SATA speed. If I didn't have a PCI telephony card I wanted to keep, I'd replace it with a Pi.