Older Quad-CPU servers seem to be a "goldmine" right now with GPU shortage and popularity of Cryptonight coins like ITNS.
Even so, older CPU's aren't particularly efficient with cryptonight.
I have an old Intel Xeon E5645 6 core (85W TDP) in my secondary machine and it struggles with 200 H/s with 6 threads. And it should excel with its 12 Mb of cache.
My laptop has a tiny core i7 7500u (15W TDP) and it does 130 H/s with 2 threads...