Hi,
Found this on a site, unsure of its accuracy, feel free to correct it:
Computers with 1 rating have the minimum requirements to run Windows Vista
or "Longhorn" Server. You won't get Windows Aero, you may even struggle with
a theme displayed. Media Center will not be able to run properly, but will
have simple productivity abilities such as basic game playing and writing
documents in Microsoft Office 2007.
Minimum requirements:
256MB RAM
CD-R/DVD-R Drive
1024x768 standard Plug and Play Monitor
Onboard graphics and sound hardware
2 With a rating of 2, you should already notice that overall performance
would be better than having Windows XP on your machine. Although Windows
Aero maybe available on this rated machine, enabling Windows Aero could
dramatically reduce performance due to the services and memory that use this
feature. Those rated at 1 may not be able to run Media Center either, but
can still perform basic productivity tasks and play low level 3D games -
however Direct3D enables games may struggle excessively.
Minimum requirements:
Pentium 4 2.0 GHz or AMD Athlon 2000+
512MB RAM
CD-RW/DVD-R Drive
1024x768 standard Plug and Play Monitor
32MB graphics, on-board sound
3 Computers rated at 3 are deemed "average" computers and should be able
to slot well into Windows Vista Home Basic, and run as a basic server on
Windows Server "Longhorn". These machines should be able to display Standard
Aero without trouble, but may not display Windows Aero. High definition
video's should be able to play on these machines but advanced codec's may be
necessary to reduce CPU usage. Direct3D games should play very well, but
Media Center may be unavailable however.
Minimum requirements:
Pentium 4 2.8 GHz or AMD Athlon 2800+
512MB RAM
DVD-R Drive
1280 x 1024 capable monitor resolution
64MB graphics, 32MB sound
Vertex/Pixel shader 2 capable hardware (DirectX 9 support in hardware)
4 Computers which have a rating of 4 should be able to have Windows Aero
enabled, as long as they have WDDM/LDDM drivers which support the graphics
card. These machines should also work very well with Media Center and
support two tuners. High definition streaming or high density video files
should be easy on the processor and much more stable to watch. 4 rated
computers should also have very good support for 3D games and first-person
shooters and other Direct3D intensive refresh rate games.
Minimum requirements:
Pentium 4 3.2 GHz or AMD Athlon 3200+
512MB RAM
DVD-R Drive
1280 x 1024 capable monitor resolution
128MB graphics, 32MB sound
Vertex/Pixel shader 2 capable hardware (DirectX 9 support in hardware)
WDDM/LDDM drivers (Windows/Longhorn Display Driver Model)
5 These computers with a rating of 5 can on occasion cause the most
technical of people to experience temporary paralysis from the neck down as
these computers are so incredibly freakingly hot! These are "gold logo"
computers which are basically high-server definition computers enabling
domain controllers and most other server roles to be run on these computers.
Windows Vista Ultimate can run brilliantly without trouble, and Windows
Server "Longhorn" should work exceptionally. Windows Aero will run easily
and multi-channel Media Center is well suited with this rating. The next
generation of games should run very well with these machines, but 16-bit
applications will not run... but who needs it when you've got this beast to
play with?
Minimum requirements:
Pentium 4 4.4 GHz or AMD 4400+
1GB RAM
64-bit processor
DVD-RW Drive
1600 x 1200 capable monitor resolution
256MB graphics, 64MB sound
DirectX 10 compatible hardware
Vertex/Pixel shader 2 capable hardware (DirectX 9 support in hardware)
WDDM/LDDM drivers (Windows/Longhorn Display Driver Model)
Source:
http://www.vistabase.co.uk/welcome.php?subcats/performance/performancerating
-Ben