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Explore the differences and similarities between the current version and prior versions of Red Hat® Enterprise Linux® Server.

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  Version 3 Version 4 Version 5 Version 6
  AS ES AS ES Advanced Platform Server  
Server architecture support
x86, AMD64, Intel 64 Yes Yes Yes Yes Yes Yes Yes
Itanium 2 Yes Yes Yes Yes Yes Yes No
IBM POWER Yes No Yes No Yes Yes Yes
IBM Mainframe Yes No Yes No No Yes Yes
Server support limits as defined by Red Hat Enterprise Linux product subscription
Maximum physical CPUs/sockets1 Unlimited 2 Unlimited 2 Unlimited 2 Varies per subscription
Maximum memory Unlimited 8GB Unlimited 16GB Unlimited Unlimited Unlimited
Maximum virtualized guests/instances2 N/A N/A N/A N/A Unlimited 4 1/4/Unlimited (varies per subscription)
Storage virtualization (with Red Hat GFS and Cluster Suite) N/A N/A N/A N/A Yes No Optional
Included Red Hat Network modules Update module Update module Update module Update module Update module Update module Update module


  1. Red Hat defines physical CPUs equivalently to sockets, so a multicore and/or hyperthreading CPU is counted as a single socket when determining which subscription to purchase.

  2. Using the virtualization technology included with Red Hat Enterprise Linux.