HP dc7800 manual IGC Standard 2D Display Modes, Sdram Installed Maximum Memory Allocation

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Integrated Graphics Subsystem

The IGC includes 2D and 3D accelerator engines working with a deeply-pipelined pre-processor. Hardware cursor and overlay generators are also included as well as a legacy VGA processor core. The controller supports three display devices:

One progressive-scan analog monitor

Up to two additional video displays with the installation of an optional Advanced Digital Display (ADD2) card in the PCI Express x16 graphics slot.

The controller can support LVDS, TMDS, or TV output with the proper encoder option. Special features of the integrated graphics controller include:

400-MHz core engine

350-MHz 24-bit RAMDAC

2D engine supporting GDI+ and alpha stretch blithering up to 2048 x 1536 w/32-bit color @ 75 Hz refresh (QVGA)

3D engine supporting Z-bias and up to 1600 x 1200 w/32-bit color @ 85 hz refresh

The IGC uses a portion of system memory for instructions, textures, and frame (display) buffering. Using a process called Dynamic Video Memory Technology (DVMT), the controller dynamically allocates display and texture memory amounts according to the needs of the application running on the system.

The total memory allocation is determined by the amount of system memory installed in a system. The video BIOS pre-allocates 8 megabytes of memory during POST. System memory that is pre-allocated is not seen by the operating system, which will report the total amount of memory installed less the amount of pre-allocated memory.

The IGC will use, in standard VGA/SVGA modes, pre-allocated memory as a true dedicated frame buffer. If the system boots with the OS loading the IGC Extreme Graphics drivers, the pre-allocated memory will then be re-claimed by the drivers and may or may not be used by the IGC in the “extended” graphic modes. However, it is important to note that pre-allocated memory is available only to the IGC, not to the OS.

The Q35's DVMT function is an enhancement over the Unified Memory Architecture (UMA) of earlier systems. The DVMT of the Q35 selects, during the boot process, the maximum graphics memory allocation possible according on the amount of system memory installed:

 

 

 

Table 6-1.

 

IGC Standard 2D Display Modes

 

 

SDRAM Installed

Maximum Memory Allocation

128 to 256 megabytes

8-32 MB

257 to 511 megabytes

8-64 MB

>512 megabytes

8-128 MB

The actual amount of system memory used by the IGC in the “extended” or “extreme” modes will increase and decrease dynamically according to the needs of the application. The amount of memory used solely for graphics (video) may be reported in a message on the screen, depending on the operating system and/or applications running on the machine.

For viewing the maximum amount of available frame buffer memory MS Windows go to the Control Panel and select the Display icon, then > Settings > Advanced > Adapter.

 

Technical Reference Guide

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Contents October Technical Reference GuideTechnical Reference Guide Contents Processor/Memory Subsystem System SupportInput/Output Interfaces Integrated Graphics Subsystem Power and Signal DistributionError Messages and Codes Index System BiosOnline Viewing About this GuideAdditional Information Sources Model Numbering ConventionIntroduction Values Serial NumberNotational Conventions Special NoticesAcronyms and Abbreviations Acronym or Description Common Acronyms and AbbreviationsCPU CMCCmos CPQFPU EscdFifo FPMAcronym or Abbreviation Description Acronyms and AbbreviationsPCM PCAPCI PCI-ESmart SgramSimd SimmVGA VACVDC VesaIntroduction System OverviewFeatures Feature Difference Matrix by Form Factor Sodimm Dimm4GB 8GB System Architecture Architectural Differences By Form FactorFunction HP Comapq dc7800 Business PC Architecture, Block diagram Intel Processor Support Chipset Chipset Components and FunctionalityComponents Function Component Name Function Support ComponentsSystem Memory Support Component FunctionsNetwork Interface Controller Mass StorageSerial and Parallel Interfaces Universal Serial Bus InterfaceIntegrated Graphics Controller Graphics SubsystemAudio Subsystem Integrated Graphics Subsystem StatisticsParameter Operating Non-operating SpecificationsEnvironmental Specifications Factory Configuration Power Supply Electrical SpecificationsParameter Usdt SFF CMT Physical SpecificationsParameter Measurement Diskette Drive SpecificationsCD-RW/DVD-ROM Combo LightScribe Combo Optical Drive SpecificationsDVD/CD-RW SuperMulti ParameterParameter 80 GB 160 GB 250 GB Hard Drive SpecificationsSystem Overview Processor/Memory Subsystem Intel Processor Overview Intel ProcessorsForm Processor Changing/UpgradingSupported Processors ClockMemory Subsystem Channel a Channel B Socket Socket 2 Socket 4 Total Memory UpgradingMemory Mapping and Pre-allocation Memory Socket LoadingSystem Memory Map for maximum of 8 gigabytes PCI 2.3 Bus Operation PCI Bus OverviewPCI Component Function # Device # Wired to PCI Component Configuration Access PCI BusPCI Bus Mastering Devices PCI Express Bus OperationSoftware/Driver Layer Transaction Protocol LayerLink Layer PCI Power Management SupportOption ROM Mapping PCI InterruptsPCI Connectors PCI 2.3 ConnectorPCI 2.3 Bus Connector Pinout PCI Express Bus Connector Pinout PCI Express ConnectorsMode Apic ModeSystem Resources InterruptsSystem Interrupts System Board Direct Memory AccessConnector PCI slot 1 PCI slot 2 PCI slot 3 PCI Interrupt DistributionClearing Cmos Real-Time Clock and Configuration MemorySecurity Functions Configuration Memory Cmos MapSystem Management Standard Cmos LocationsInterface Security Power-On / Setup PasswordSetup Password Cable Lock ProvisionAcpi Wake-Up Event System Wakes From Power ManagementSmart Cover Lock Optional Acpi Wake-Up EventsSystem Operational Status LED Indications System Status PowerLED Beeps Action RequiredSystem Status Thermal Sensing and CoolingSystem I/O Map Register Map and Miscellaneous FunctionsGpio Functions ICH9 FunctionsSystem I/O Map Controller Functions Input/Output Interfaces Pin Sata Connector Pinout Sata InterfacePin Description Pin Slim IDE Connector Pinout Pin SignalPata Interface Diskette Drive Interface Pin Signal Description Pin Diskette Drive Connector PinoutSerial Interface DB-9 Serial Connector PinoutParallel Interface Standard Parallel Port ModeEnhanced Parallel Port Mode Extended Capabilities Port ModeParallel Interface Connector DB-25 Parallel Connector PinoutPin Signal Function Keyboard Interface Operation Keyboard/Pointing Device InterfaceData Keyboard/Pointing Device Interface ConnectorKeyboard/Pointing Device Connector Pinout Pointing Device Interface OperationUniversal Serial Bus Interface USB ConnectorUSB Connector Location Controller Signals USDT, SFF Form Factors CMT Form FactorUSB Color Code USB Connector PinoutUSB Cable Data USB Cable Length DataAudio Subsystem Audio Subsystem Functional Block DiagramHD Audio Controller HD Audio Link BusAudio Multistreaming Audio Specifications HD Audio Subsystem SpecificationsADC/DAC LAN I/F NIC Network Interface ControllerPower Management Support Wake-On-LAN SupportAlert Standard Format Support Parameter Compatibility standard orprotocol NIC ConnectorNIC Specifications NIC SpecificationsIntegrated Graphics Subsystem Functional Description Q35 IGC, Block diagramIGC Standard 2D Display Modes Sdram Installed Maximum Memory AllocationDisplay Modes Resolution Maximum Refresh Rate Analog Digital MonitorUpgrading Monitor Connectors Analog Monitor ConnectorDB-15 Monitor Connector Pinout Digital Monitor Connector Integrated Graphics Subsystem Usdt Power Distribution Power DistributionUsdt 135-Watt Power Supply Unit Specifications SFF Power DistributionMin Range Current Max Surge Tolerance Loading Ripple SFF 240-Watt Power Supply Unit SpecificationsCMT Power Distribution CMT 365-Watt Power Supply Unit SpecificationsRange or Min Current Max Surge Tolerance Loading Ripple Energy Star Compliancy Shows the power supply cabling for CMT systemsPressed Power Button Results Power ControlPower Button Power Button ActionsPower Button Actions Power LED Condition Wake-On-LAN Wake Up EventsConsumption To S0 by Required System Power StatesPower Transition OS Restart State System ConditionCR1 +5 VDC LED Signal DistributionSystem Board Component Designations Power and Signal Distribution System Bios ROM Flashing UpgradingChangeable Splash Screen Memory Detection and Configuration Boot FunctionsBoot Device Order Network Boot F12 SupportBoot Error Codes Boot Error CodesVisual power LED Audible speaker Meaning Function Mode Client Management FunctionsClient Management Functions INT15 System ID Numbers Temperature StatusDrive Fault Prediction System ID and ROM TypeType Data SmbiosManagement Engine Functions USB Legacy SupportNumerics IndexIndex
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