The Versions of Red Hat Enterprise

• Red Hat Enterprise AS : is best suited for servers that have more than 2 CPUs with greater than 8GB of system RAM. There is support for many different types of CPUs as well, such as the IBM iSeries, pSeries, and zSeries.
• Red Hat Enterprise ES : supports up to 2 CPUs and 8GB of system RAM. ES does not provide the same level of support as AS.
• Red Hat Enterprise WS : provides nearly the same functionality as Desktop. The magor difference between WS and Desktop is the number of CPUs supported. WS supports up to 2 CPUs.
• Red Hat Enterprise Desktop : supports a system with 1 CPU and up to 4GB of system RAM.

p.s. RHEL의 무료버전이랄 수 있는 CentOS도 있다.