There is no exact number to show as to how many website hosting can a server provide. No exact number is there for this as it is the host who is to determine this factor. Higher bandwidth, more mailing lists, databases etc. would help in higher server loads. Servers that are not maintained in a systematic way have lesser sites hosted. Place where customers are placed, as a lot of sites from the same time zone would have higher usage at the same time. The load usually turns out to be generally be lesser than 1 for a single processor server. A lot of importance should be given while webhosting to the amount of RAM as well as the type of network card used by the server. While going in for a server one should always go for high-end Ethernet cards as this ensures the maximum throughput of data. The biggest advantage of having multiple servers is felt only when a server crashes or when a server is hacked. A site which is hosted by the webhost is not affected and so the number of troubles is reduced in such cases. Multiple servers can also help in webhost spreading the name servers across the other servers.