integrated Dualhead in a very flexible and functional way that become world-renowned for its effectiveness. However, contrary to the video mode's name, G400 does not support full DVD decoding hardware acceleration. G400 does have partial support for the DVD video decoding process but it does not perform inverse discrete cosine transform IDCT or motion compensation in hardware (the two most demanding steps of the process). The G400 chip supports, in hardware, a texture-based surface detailing method called Environment Mapped Bump Mapping (EMBM). EMBM was actually created by BitBoys Oy and licensed to Matrox. EMBM was not supported by several competitors such as NVIDIA's GeForce 256 through GeForce 2, which only supported the simpler Dot-3 BM, but was available on the ATI Radeon 7200. Due to this lack of industry-wide support, and its toll on the limited graphics hardware of the time, EMBM only saw limited use during G400's time. Only a few games supported the feature, such as Dungeon Keeper 2 and Millennium Soldier: Expendable. EMBM requires either specialized hardware within the chip for its calculations or a more flexible and programmable graphics pipeline, such as later DirectX 8.0 accelerators like the GeForce 3 and Radeon 8500. G400's rendering pipelined uses what Matrox called "Vibrant Color Quality 2" (VCQ2), a functionality in which all internal 3D calculations are done with 32-bit precision. The goal was to prevent dithering and other artifacts caused by inadequate precision when performing calculations. The result was the best quality 16-bit and 32-bit color modes available at the time. Matrox was known for their quality analog display output on prior cards and the G400 is no exception. G400 was the benchmark for signal quality for several years, significantly outperforming some competitors (notably pre-GeForce4 NVIDIA cards). Where many cards were crippled by blurry output, especially as the resolution and refresh rate increased, the Matrox cards delivered very sharp and clear images. G400 is the first Matrox board compatible with AGP 4X. Most (REV. A) G400 boards actually only support 2X mode, but there are later revisions (REV. B), that are fully 4X compliant and run at the higher speed if the motherboard is capable as well. Performance G400 was known for being particularly dependent on the host system's CPU for high 3D performance. This was attributed both to its architecture and to the poor drivers it relied on for much of its life (especially OpenGL ICD). With