HP dc7800 manual Functional Description, Q35 IGC, Block diagram

Integrated Graphics Subsystem

6.2 Functional Description

The Intel Q35 GMCH component includes an Intel Integrated Graphics Media Accelerator 3100 controller (Figure 6-1). This integrated graphics controller (IGC) operates internally of the PCIe x16 bus and 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 PCIe graphics interface. These SDVO ports may be used by an Advanced Digital Display (ADD2) card installed in the PCI-E x16 graphics slot in driving two digital displays with a 200-megapixel clock.

		Q35 GMCH
Analog	RGB	Integrated
Monitor			SDRAM
		GMA 3100
Digital	DVI-D		Controller
		Controller
Monitor [1]
	PCIe
PCIe x16	& SDVO Data	PCIe I/F
Graphics slot [2]

DDR2

SDRAM (System

Memory)

NOTE:[1] USDT form factor only.

[2] SFF and CMT form factors only.

Figure 6-1. Q35 IGC, Block diagram

The IGC provides the following features:

■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 (SFF and CMT form factors only)

■Drives a DVI monitor directly (USDT form factor only)

6-2 www.hp.com Technical Reference Guide