Redhat Server versions comparison chart

	Version 3		Version 4		Version 5		Version 6
	AS	ES	AS	ES	Advanced Platform	Server
Server Architecture support
x86, AMD64, Intel64	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Itanium	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/sockets [1]	Unlimited	2	Unlimited	2	Unlimited	2	Varies per Subscription
Maximum memory	Unlimited	8GB	Unlimited	16GB	Unlimited	Unlimited	Unlimited
Maximum virtualized guests/instances [2]	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

Notes:

[1] Red Hat defines physical CPUs equivalently to sockets, so a multi-core 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

from ,

http://www.redhat.com/rhel/server/compare/