Hardware requirements are pretty low for an Ark server, CPU>2Ghz 1-2 cores and 6gb Ram per map. My server is an 2012 era Dell R720 rackmount PC with dual E5-2689 2.6ghz 8-core processors and 144GB of RAM and 6-600GB 15k SAS drives in RAID 10. Network requirements are pretty minimal, with 15 players online my bandwidth usage was less than 100kb/s. Used enterprise gear can be found cheap and make great game servers. I use Proxmox to host my VM's I have 10 maps running on a Win10 VM, another Linux VM hosting several Minecraft servers, another Win10 VM hosting a FiveM server and several other Linux containers running various network and web hosts. Server runs well and have never noticed any rubber banding that wasn't related to my 20/2mb/s internet connection. I don't have huge populations of players but that would impact my bandwidth more than the hardware. Mods can increase the load on the CPU and RAM usage so faster clock speed are a benifit but not a primary consideration and some mods on heavily populated servers may need slightly more than 6gb RAM.
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