I wonder why people still use Itanium CPUs? And Intel is still producing them, they even going to release the next one, named Kittson? Hasn’t x86-64 architectu

I wonder why people still use Itanium CPUs? And Intel is still producing them, they even going to release the next one, named Kittson? Hasn’t x86-64 architecture basically won? Or there’re some specific niches where Itaniums work better for some reason?