Exactly. Modern X86-64 chips got improved power saving, more cores to increase density at reduced power cost, much more powerful GPU for running compute. Plus,

Exactly. Modern X86-64 chips got improved power saving, more cores to increase density at reduced power cost, much more powerful GPU for running compute. Plus, server space buyers are conservative, they want support of a big company behind their hardware. Someone the size of Cisco, Dell or HP. Or hardware that is used by Google or Microsoft. Combine that with anticompetitive long term agreements and you get the picture. Somehow network routers have a variety of architectures inside and nobody has a problem - because they have a bunch of reputable companies behind each of them. (Variants of MIPS, ARM, ARM64 and x86 are in the wild.)