HP Kayak XU 04xx HP Kayak XU PC Workstation Technical Reference Manual Hardwar - Page 43

3 Interface Boards and Mass-Storage Drives Matrox Millennium II Video Controller Board Video Memory The video memory (also known as window RAM, or WRAM) is a local block of RAM for holding two major data structures: the double buffer (to hold one frame steady on the screen whilst the next one is being processed), and the Z-buffer (for storing depth information for each pixel). It is dual ported, so that it can be inputting and outputting simultaneously. There is also hardware support for Gouraud shading, Phong shading and texture mapping. The Matrox Millennium II AGP graphics controller board is supplied with 4 MB of video memory. This can be upgraded with an HP upgrade module. Upgrading the memory to 8 MB (using the 4MB upgrade module D5486A), gives access to higher refresh rates and video resolutions (as summarized on the next page); upgrading the memory to 12 MB or 16 MB gives access to greater acceleration on 3D operations. The upgrade socket can alternatively be used for the installation of the Matrox MGA Rainbow Runner upgrade module (also ordered from Matrox) to support MPEG. Available Video Resolutions The number of colors supported is limited by the graphics device and the video memory. The resolution/color/refresh-rate combination is limited by a combination of the display driver, the graphics device, and the video memory. If the resolution/refresh-rate combination is set higher than the display can support, you risk damaging the display. The tables below summarize the video resolutions which are supported. Resolution 640x480 800x600 1024x768 1152x864 1280x1024 1600x1024 2D Resolution and Pixel Depth Bits/Pixel 4 MB Bits/Pixel 8, 12, 16 MB 8, 16, 24, 32 8, 16, 24, 32 8, 16, 24, 32 8, 16, 24, 32 8, 16, 24 8, 16 8, 16, 24, 32 8, 16, 24, 32 8, 16, 24, 32 8, 16, 24, 32 8, 16, 24, 32 8, 16, 24, 32 35