If you're referring to PowerEdge C1100 servers, these are **REALLY** old servers and do not even support those versions of ESXi.
however We do not have such issues on supermicro servers
if it is not supported it shouldn't be able to installed but it installs and when the network usage go above 200mbs it loses network connectivity
if it is not supported it shouldn't be able to installed
That's not always the case. Sometimes ESXi will install but basic functionality fails. That's why it's not supported.