HP Dc7600 HP Compaq dx 7200 and dc7600 Personal Computers, Technical Reference - Page 122

Integrated Graphics Subsystem 6.2 Functional Description The Intel 945G GMCH component includes an integrated graphics controller (IGC). (Figure 6-1). The IGC can directly drive an external, analog multi-scan monitor at resolutions up to and including 2048 x 1536 pixels. The IGC includes a memory management feature that allocates portions of system memory for use as the frame buffer and for storing textures and 3D effects. The IGC provides two SDVO channels that are multiplexed through the PCI Express graphics interface. These SDVO ports may be used by an Advanced Digital Display (ADD2) card installed in the PCI Express (PCI-E) graphics slot in driving two digital displays with a 200-megapixel clock. The SSF, ST, MT, and CMT systems may be upgraded by installing a separate PCI-E graphics card in the PCI Express x16 slot, which disables the onboard IGC. All systems can support an optional PCI-E SDVO card. The PCI-E slot of USDT system accepts a reverse-layout SDVO ADD2-type card only. All systems may be also be upgraded by installing a PCI graphics card in the PCI 2.3 slot. 82945G GMCH Monitor RGB Integrated Graphics Controller PCI Express x16 Graphics slot [1] PCI-E & SDVO Data PCI Expr. I/F SDRAM Controller NOTE: [1] In USDT form factor, accepts reverse-layout SDVO ADD2 card only. In SFF, ST, MT, and CMT form factors, accepts normal-layout cards. DDR2 SDRAM (System Memory) Figure 6-1. 945G-Based Graphics, Block diagram The Integrated Graphics Controller provides the following features: ■ 2x performance over previous generation IGC. ■ Rapid pixel and texel rendering using four pipelines that allow 2D and 3D operations to overlap, speeding up visual effects, reducing the amount of memory for texture storage. ■ Zone rendering for optimizing 3D drawing, eliminating the need for local graphics memory by reducing the bandwidth. ■ Dynamic video memory allocation, where the amount of memory required by the application is acquired (or released) by the controller. ■ Intelligent memory management allowing tiled memory addressing, deep display buffering, and dynamic data management. ■ Provides two serial digital video out (SDVO) channels for use by an appropriate ADD2 accessory card. 6-2 www.hp.com Technical Reference Guide