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The different editions of Windows 7 have been designed and marketed
toward people with different needs.[118] Out of the different editions
(Starter, Home Basic, Home Premium, Professional, Enterprise, and
Ultimate), the Starter edition has been designed and marketed for lower
cost notebooks, Home Basic for emerging markets, Home Premium for normal
home users, Professional for businesses, Enterprise for larger businesses
and corporations, and Ultimate for enthusiasts.[118]
Hardware requirements
Computers that display this sticker meet the requirements for Windows 7.

Microsoft has published the minimum specifications for a system to run
Windows 7.[119] Requirements for the 32-bit version are similar to that
of premium editions of Vista, but are higher for 64-bit versions.
Microsoft has released an upgrade advisor that determines if a computer
is compatible with Windows 7.
Minimum hardware requirements for Windows 7[119] Architecture 32-bit
Processor 1 GHz IA-32 processor 1 GHz x86-64 processor
Memory (RAM)      1 GB 2 GB
Graphics card     DirectX 9 graphics processor with WDDM driver model 1.0
(Not absolutely necessary; only required for Aero)
HDD free space    16 GB of free disk space     20 GB of free disk space
Optical drive     DVD-ROM drive[120] (Only to install from DVD-ROM media)
SATA AHCI support       See below

Additional requirements to use certain features:[119]

    SATA AHCI support was not added to Windows until XP Service Pack 1.
As a result, in most motherboards the BIOS default for SATA support is to
(emulate) IDE (ATA) rather than use AHCI (SATA). As explained here, this
setting needs to be changed before installation, and any chipset-specific
AHCI or RAID drivers need to be loaded (from a USB Flash drive, for
example) at installation time.
    Windows XP Mode (Professional, Ultimate and Enterprise): Requires an
additional 1 GB of RAM and additional 15 GB of available hard disk space.
The requirement for a processor capable of hardware virtualization has
been lifted.[121]
    Windows Media Center (included in Home Premium, Professional,
Ultimate and Enterprise), requires a TV tuner to receive and record TV.

Physical memory limits

Maximum limits on physical memory (RAM) that Windows 7 can address vary
depending on both the Windows version and between 32-bit and 64-bit
versions.[122] The following table specifies the maximum physical memory
limits supported:
Physical memory limits for Windows 7[122] Version Limit in 32-bit
Windows    Limit in 64-bit Windows
Windows 7 Ultimate     4 GB 192 GB
Windows 7 Enterprise
Windows 7 Professional
Windows 7 Home Premium       16 GB
Windows 7 Home Basic   8 GB
Windows 7 Starter      2 GB   N/A
Processor limits

The maximum total number of logical processors[123] in a PC that Windows
7 supports is: 32[124] for 32-bit, 256[125] for 64-bit.

The maximum number of physical processors in a PC that Windows 7 supports
is: 2 for Professional, Enterprise, and Ultimate, and 1 for Starter, Home
Basic, and Home Premium.[126]

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