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I have had a $5 VPS hold 300 at one time with no issues.
I have a $10 VPS now that runs 600+ clients. Though at 600-800 clients the bandwidth starts to become an issue. So I would say no more 700 on any one VPS on DO.
I have a $10 vps with teamspeak and a simple wordpress install… I am maxed out CPU and RAM for no reason… only things running on the server is teamspeak and wordpress… shouldn’t be having this…
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