If it were an Itanium, the OP would know it. They’re not common (and I doubt Puppy would have booted on such a system—it isn’t compatible with x86).
Also, support for that arch is being dropped from the Linux kernel as of 6.7.0, so looking for a supporting distro would be a fool’s quest (Gentoo still technically offers Itanium packages, but they’re on the way out.)