Minimum System Requirements
Minimum Requirements are very subjective.   Here are sets of requirements that will help you determine what kind of minimum requirements you would prefer to have.  When in doubt, go with the Linspire requirements for the best experience.

Linspire 4.5 Linspire 5.0
Lindows Inc. Recommends
  • 800MHz processor (or equivalent AMD processor)
  • 128 MB RAM
  • 2GB of available hard disk space
  • 1024 x 768 or higher resolution and monitor* (3-D graphics accelerator card for some games, screen savers, etc.)
  • CD-ROM or DVD drive, Keyboard & Mouse
  • Linspire-compatible sound card and speakers or headphones**
  • Linspire-compatible 56 Kbps hardware modem, cable modem, or DSL modem**
  • Ethernet card for Internet/LAN connectivity**
  • PC with 800 MHz or higher processor**
  • 128 MB of RAM (256 MB or higher recommended for best performance)**
  • Hard drive with 4 GB free space**
  • SVGA or higher resolution and monitor* (3-D graphics accelerator card for some games, screen savers, etc.)
  • CD-ROM or DVD drive, Keyboard & Mouse
  • Linspire-compatible sound card and speakers or headphones**
  • Linspire-compatible 56 Kbps hardware modem, cable modem, or DSL modem**
  • Ethernet card for Internet/LAN connectivity**
Gigabytes Recommended Minimum
  • 300MHz processor (Intel or AMD processor)
  • 128 MB RAM
  • 4GB of available hard disk space
  • 15" Monitor capable of 1024 x 768 or higher resolution @75Hz
  • 12x or better CD-ROM, Keyboard & Mouse
  • 1 GHz or higher processor
  • 512 MB of RAM 
  • Hard drive with 10 GB free space
  • XGA or higher resolution and monitor (3-D graphics accelerator card for some games, screen savers, etc.)
  • CD-ROM
Has Successfully been tested on
  • 233MHz Intel Pentium MMX
  • 96 MB RAM
  • 2.5GB Harddrive
  • 15" monitor @ 1024x768 @75Hz
  • 2Mb  Graphics Card
  • 12x CD-ROM
  • ESS Sound
  • Result: 5 minute boot time, slow to load programs but stable and worked well.
  • 450 MHz processor
  • 192 MB of RAM 
  • Hard drive with 4 GB free space
  • XGA or higher resolution and monitor (3-D graphics accelerator card for some games, screen savers, etc.)
  • CD-ROM