Redhat Desktop versions comparison chart

	Version 4		Version 5			Version 6
	Workstation	Desktop	Desktop	Desktop with Workstation option	Desktop with Multi OS option	Workstation	Client
Desktop Architecture support
X86, AMD64, Intel64	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Itanium2	Yes	No	No	No	No	No	No
Desktop Support limits as defined by Red Hat Enterprise Linux Product Subscription
Maximum physical CPUs/sockets [1]	2	1	1	2	1	2	1
Maximum memory	Unlimited	4GB	4GB	Unlimited	4GB	Unlimited	8GB
Maximum virtualized guests/instances [2]	N/A	N/A	N/A	N/A	4	1	1
Storage virtualization (with Red Hat GFS and Cluster Suite)	N/A	N/A	No	No	No	No	No
Included Red Hat Network modules	Update Module	Update Module	Update, Management, & Provisioning modules			Update, Management, & Provisioning modules

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/desktop/compare/

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/

Red Hat Enterprise Linux Technology capabilities and limits

	Version 3	Version 4	Version 5	Version 6
Maximum logical CPUs [2]
x86	16	32	32	32
Itanium2	8	256/512	256/1024	N/A [6]
X86_64	8	64/64	160/255	160/4096
POWER	8	64/128	128/128	128
System z	32 (z900)	64 (z10 EC)	80 (z196)	80 (z196)
Maximum memory [5]
X86	64GB [3]	64GB [3]	16GB [4]	16GB [4]
Itanium2	128GB	2TB	2TB	N/A [6]
X86_64	128GB	256GB/1TB	1TB	2TB/64TB
POWER	64GB	128GB/1TB	512GB/1TB	2TB
System z	256GB (z900)	1.5TB (z10 EC)	3TB (z196)	3TB (z196)
Required minimums
X86	256MB	256MB	512MB minimum/ 1 GB/logical CPU recommended	512MB minimum/ 1 GB/logical CPU recommended
X86_64	256MB	256MB	512MB/ 1 GB/logical CPU recommended	1GB minimum/ 1 GB/logical CPU recommended
Itanium2	512MB	512MB	512MB/ 1 GB/logical CPU recommended	N/A [6]
POWER	512MB	512MB	1GB minimum/ 2GB recommended	2GB minimum/ 2GB required per install
Minimum diskspace	800MB	800MB	1GB minimum/ 5GB recommended	1GB minimum/ 5GB recommended
Filesystems and Storage Limits
Maximum filesize (Ext3)	2TB	2TB	2TB	2TB
Maximum filesystem size (Ext3)	2TB	8TB	16TB	16TB
Maximum filesize (Ext4)	--	--	16TB	16TB
Maximum filesystem size (Ext4)	--	--	16TB	16TB
Maximum filesize (GFS)	2TB	16TB/8EB	16TB/8EB [7]	N/A
Maximum filesystem size (GFS)	2TB	16TB/8EB	16TB/8EB [7]	N/A
Maximum filesize (GFS2)	--	--	25TB	100TB
Maximum filesystem size (GFS2)	--	--	25TB	100TB
Maximum filesize (XFS)	--	--	100TB	100TB
Maximum filesystem size (XFS)	--	--	100TB	100TB
Maximum Boot LUN size (BIOS)	--	--	<2TB	<2TB [10]
Maximum Boot LUN size (UEFI)	--	--	NA	Any [10]
Maximum x86 per-process virtual address space	Approx 4GB	Approx 4GB	Approx 3GB [4]	Approx 3GB [4]
Maximum x86_64 per-process virtual address space		512GB	2TB	128TB
Kernel and OS features
Kernel foundation	Linux 2.4.21	Linux 2.6.9	Linux 2.6.18	2.6.32 - 2.6.34
Compiler/toolchain	GCC 3.2	GCC 3.4	GCC 4.1	GCC 4.4
Languages supported	10	15	19	22
NIAP/CC certified [11]	Yes (3+)	Yes (4+)	Yes (4+)	Under Evaluation
Common Criteria certified KVM [11]	--	--	Under Evaluation	Under Evaluation
IPv6	--	--	Ready Logo Phase-II	Under Evaluation
Compatibility libraries	V2.1	V2.1 and V3	V3 and V4	V4 and V5
FIPS certified [11]	--	--	Yes	Under Evaluation
Common Operating Environment (COE) compliant	Yes	Yes	N/A	N/A
LSB compliant	Yes - 1.3	Yes - 3	Yes - 3.1	Under Evaluation
GB18030	No	Yes	Yes	Yes
Client environment
Desktop GUI	Gnome 2.2	Gnome 2.8	Gnome 2.16	Gnome 2.28
Graphics	XFree86	X.org	X.org 7.1.1	X.org 7.4
OpenOffice	V1.1	V1.1.2	V2.0.4 [12]	V3.2 [12]
Gnome Evolution	V1.4	V2.0	V2.8.0	V2.28
Default browser	Mozilla	Firefox	Firefox 1.5 [12]	Firefox 3.6 [12]

Notes:

[1] Supported limits reflect the current state of system testing by Red Hat and its partners for mainstream hardware. Systems exceeding these supported limits may be included in the Hardware Catalog after joint testing between Red Hat and its partners. If they exceed the supported limits posted here, entries in the Hardware Catalog will include a reference to the details of the system specific limits, and are fully supported. In addition to supported limits reflecting hardware capability, there may be additional limits under the Red Hat Enterprise Linux subscription terms. Supported limits are subject to change as on-going testing completes.

[2] Red Hat defines a logical CPU as any schedulable entity. So every core/thread in a multi-core/thread processor is a logical CPU

[3] The "SMP" kernel supports a maximum of 16GB of main memory. Systems with more than 16GB of main memory use the "Hugemem" kernel. In certain workload scenarios it may be advantageous to use the "Hugemem" kernel on systems with more than 12GB of main memory.

[4] The x86 "Hugemem" kernel is not provided in Red Hat Enterprise Linux 5 or 6.

[5] The architectural limits are based on the capabilities of the RHEL kernel and the physical hardware. RHEL 6 limit is based on 46-bit physical memory addressing. RHEL 5 limit is based on 40-bit physical memory addressing. All system memory should be balanced across NUMA nodes in a NUMA capable system.

[6] Red Hat Enterprise Linux 6 does not include support for the Itanium 2 architecture.

[7] If there are any 32-bit machines in the cluster, the maximum gfs file system size is 16TB. If all machines in the cluster are 64-bit, the maximum size is 8EB.

[8] Officially support 125 CPUs across the entire machine.

[9] Requires Intel EPT and AMD RVI technology support

[10] UEFI and GPT support required for more that 2TB boot LUN support (https://access.redhat.com/kb/docs/DOC-16981)

[11] Security certification details are available at: http://www.redhat.com/solutions/government/certifications/

[12] Firefox, Thunderbird, and OpenOffice applications will be updated during the lifecycle

From ,

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