A quick Google search and here you go:
http://forum.cakewalk.com/Minimum-system-requirements-for-X3-m2922734.aspx Oh, I use a CF30 with Sonar 8.5 for live stuff. Been using it for years! Works fine. Though I am only capturing 16 channels digital audio using a Mackie 1640 with fire wire interface.
But 8.5's requirements are different:
Before I get too far into this review, I should mention the system requirements for Sonar Producer 8.5.
System RequirementsMinimum-Operating System: Windows XP SP3, Windows Vista SP2 (32 and 64-bit), or Windows 7 (32 and 64-bit) SONAR does not officially support Windows 95, 98, ME, NT, 2000, XP x64 or pre-release (RTM) versions of Windows7
-Processor Speed: Intel Pentium 4 1.3GHz, AMD Athlon XP 1500+ or higher
-RAM: 512MB
-Graphics: 1024 x 768, 16-bit color
-Hard disk space: 200MB for core program
-MIDI interface: Windows-compatible (Required to connect external MIDI devices)
-Audio interface: Windows-compatible (for audio playback)
-Media drive: DVD-ROM, DVD+/-R, or DVD +/- RW drive (for installation because SONAR is presented on DVD media, so DVD-ROM, DVD+/-R, or DVD+/- RW)
-Webserver access: None
Recommended-Operating System: Windows XP SP3, Windows Vista SP2 (32 and 64-bit), or Windows 7 (32 and 64-bit) SONAR does not officially support Windows 95, 98, ME, NT, 2000, XP x64 or pre-release (RTM) versions of Windows7
-Processor Speed: Intel Pentium 4 2.8 GHz, AMD Athlon XP 2800+ or higher
-RAM: 1GB or higher
-Graphics: 1280 x 960, 24-bit color or higher
-Hard disk space: 30GB for program and content
-Hard disc type: EIDE / Ultra DMA (7200 RPM) or SATA
-MIDI interface: Windows-compatible (Required to connect external MIDI devices)
-Audio interface: Windows-compatible (for audio playback)
-Media drive: DVD-ROM, DVD+/-R, or DVD +/- RW drive (for installation because SONAR is presented on DVD media, so DVD-ROM, DVD+/-R, or DVD+/- RW)
-Webserver access: Available web server space with FTP access privileges (Cakewalk Publisher requires you to have available web server space with FTP access privileges. An internet connection is required for music uploading. A broadband connection is recommended.)
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