Jaton Video-338PCI Series, User Manual

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Q6 What does "software 3D" mean?
Answer
Software 3D is generally used to mean using non-specific (2D) hardware in
conjunction with the CPU to render for 3D applications. Some of these
techniques allow usable 3D applications when high-powered and/or MMX™-
equipped CPU's are employed along with special-case software optimization
techniques. As stated above, SW 3D can achieve credible results with today's
(software optimized) applications, but the rising popularity of good 3D hardware
at the consumer price level is inexorably compelling the public to expect
hardware level scene enhancements and frame rates.