HP dc7800 tower manual GMA 4500 Memory Allocation, Sdram Installed Maximum Memory Allocation

Page 73

Integrated Graphics Subsystem

The GMA 4500 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 GMA 4500 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 GMA Extreme Graphics drivers, the pre-allocated memory will then be re-claimed by the drivers and may or may not be used by the GMA in the “extended” graphic modes. However, it is important to note that pre-allocated memory is available only to the GMA, not to the OS.

The Q45's DVMT function is an enhancement over the Unified Memory Architecture (UMA) of earlier systems. The DVMT of the Q45 selects, during the boot process, the maximum graphics memory allocation possible according on the amount of system memory installed:

Table 6-1.

GMA 4500 Memory Allocation

SDRAM Installed

Maximum Memory Allocation

1

GB

256 or 512 MB

>

1 GB

384 MB

The actual amount of system memory used by the GMA 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.

The Microsoft Direct Diagnostic tool included in most versions of Windows may be used to check the amount of video memory being used. The Display tab of the utility the “Approx. Total Memory” label will indicate the amount of video memory. The value will vary according to OS.

✎Some applications, particularly games that require advanced 3D hardware acceleration, may not install or run correctly on systems using the GMA.

 

Technical Reference Guide

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Contents September Technical Reference GuideTechnical Reference Guide Contents System Support Processor/Memory SubsystemInput/Output Interfaces Integrated Graphics Subsystem Power and Signal DistributionError Messages and Codes Index System BiosAbout this Guide IntroductionAdditional Information Sources Online ViewingNotational Conventions Serial NumberSpecial Notices ValuesAcronyms and Abbreviations Common Acronyms and AbbreviationsAcronym or Abbreviation Description CGA CDSCMC CmosEPP EisaEide EscdISA IRQLAN LCDPAL ODDPata PCASEC SdvoSecam SgramUSB URLUTP VACIntroduction Introduction System OverviewFeatures Sodimm Dimm Feature Difference Matrix by Form Factor1ODD Architectural Differences By Form Factor System ArchitectureFunction HP Compaq dc7900 Business PC Architecture, Block diagram Intel Processor Support Chipset Components and Functionality ChipsetComponents Function System Memory Support ComponentsSupport Component Functions Component Name FunctionSerial Interface Mass StorageUniversal Serial Bus Interface Network Interface ControllerAudio Subsystem Graphics SubsystemIntegrated Graphics Subsystem Statistics Integrated Graphics ControllerEnvironmental Specifications Factory Configuration SpecificationsPower Supply Electrical Specifications Parameter Operating Non-operatingParameter Usdt SFF CMT Physical SpecificationsHP SuperMulti LightScribe Optical Drive SpecificationsParameter CD-RW/DVD-ROM ComboParameter 80 GB 160 GB 250 GB Hard Drive SpecificationsProcessor/Memory Subsystem Architecture Processor/Memory SubsystemIntel Processor Overview Intel ProcessorsSupported Processors partial listing Processor Changing/UpgradingClock FormMemory Subsystem Memory Mapping and Pre-allocation Memory UpgradingMemory Socket Loading Channel a Channel B Socket Socket 2 Socket 4 TotalSystem Memory Map for maximum of 8 gigabytes PCI Bus Overview System SupportPCI 2.3 Bus Operation PCI Component Function # Device # Wired to PCI Component Configuration Access PCI BusSoftware/Driver Layer PCI Express Bus OperationTransaction Protocol Layer PCI Bus Mastering DevicesOption ROM Mapping PCI Power Management SupportPCI Interrupts Link LayerPCI 2.3 Connector PCI ConnectorsPCI 2.3 Bus Connector Pinout PCI Express Bus Connector Pinout PCI Express ConnectorsSystem Resources Apic ModeInterrupts ModePCI Interrupt Distribution Direct Memory AccessClearing Cmos Real-Time Clock and Configuration MemorySystem Management Configuration Memory Cmos MapStandard Cmos Locations Security FunctionsSetup Password Power-On / Setup PasswordCable Lock Provision Interface SecuritySmart Cover Lock Optional Power ManagementAcpi Wake-Up Events Acpi Wake-Up Event System Wakes FromSystem Status System Status PowerLED Beeps Action RequiredThermal Sensing and Cooling System Operational Status LED IndicationsSystem I/O Map Register Map and Miscellaneous FunctionsPort Function System I/O MapICH10 Functions Gpio FunctionsSIO Controller Functions Input/Output Interfaces SATA/eSATA Interfaces Pin Sata Connector PinoutSata interface Pin DescriptionESATA interface Optional eSATA Bracket/Cable AssemblyDiskette Drive Interface Pin Signal Description Pin Diskette Drive Connector PinoutSerial Interface DB-9 Serial Connector PinoutEnhanced Parallel Port Mode Standard Parallel Port ModeExtended Capabilities Port Mode Parallel Interface SupportDB-25 Parallel Connector Pinout Parallel Interface ConnectorPin Signal Function Keyboard Interface Operation Keyboard/Pointing Device InterfaceKeyboard/Pointing Device Connector Pinout Keyboard/Pointing Device Interface ConnectorPointing Device Interface Operation DataController Signals USB Connector Location all form factors USB ConnectorUniversal Serial Bus Interface ICH10 USB Port MappingUSB Cable Data USB Connector PinoutUSB Cable Length Data USB Color CodeAudio Subsystem Audio Subsystem Functional Block DiagramHD Audio Link Bus HD Audio ControllerAudio Multistreaming HD Audio Subsystem Specifications Audio SpecificationsParameter Measurement ADC/DACLAN I/F NIC Network Interface ControllerWake-On-LAN Support Power Management SupportAlert Standard Format Support NIC Specifications NIC ConnectorNIC Specifications Parameter Compatibility standard orprotocolIntegrated Graphics Subsystem RGB Functional DescriptionGMA 4500 Memory Allocation Sdram Installed Maximum Memory AllocationDisplay Modes Resolution Maximum Refresh Rate Analog Digital MonitorIGC Standard 2D Display Modes Upgrading Analog Monitor Connector Monitor ConnectorsDB-15 Monitor Connector Pinout Pin Signal DisplayPort ConnectorIntegrated Graphics Subsystem Power Distribution Power and Signal DistributionUsdt Power Distribution Usdt 135-Watt Power Supply Unit Specifications 2 SFF/CMT Power DistributionMin Range Current Max Surge Tolerance Loading Ripple SFF 240-Watt Power Supply Unit SpecificationsRange or Min Current Max Surge Tolerance Loading Ripple CMT 365-Watt Power Supply Unit SpecificationsEnergy Star Compliancy Shows the power supply cabling for CMT systemsPower Button Power ControlPower Button Actions Pressed Power Button ResultsPower LED Indications Condition Wake-On-LAN Wake Up EventsPower Transition OS Restart System Power StatesState System Condition Consumption To S0 by RequiredCR1 +5 VDC LED Signal DistributionSystem Board Component Designations Power and Signal Distribution System Bios Upgrading ROM FlashingChangeable Splash Screen Boot Device Order Boot FunctionsNetwork Boot F12 Support Memory Detection and ConfigurationBoot Error Codes Boot Error CodesVisual power LED Audible speaker Meaning Client Management Functions Function ModeClient Management Functions INT15 System ID and ROM Type Temperature StatusSystem ID Numbers SubsystemType Data Smbios FunctionsManagement Engine Functions USB Legacy SupportBeep/Power LED Codes Error Messages and CodesTable A-1 Beep/Power LED Codes Beeps Power LED Probable CausePower-On Self Test Post Messages Table A-2 Table A-2 Error Message Probable CauseTable A-3 System Error Messages Probable Cause System Error MessagesMemory Error Messages Memory Error MessagesTable A-4 Message Probable CauseTable A-5 Keyboard Error Messages Probable Cause Keyboard Error MessagesVideo Graphics Error Messages Printer Error MessagesTable A-6 Printer Error Messages Probable Cause Table A-7 Video Graphics Error Messages Probable CauseTable A-8 Diskette Drive Error Messages Probable Cause Diskette Drive Error MessagesTable A-9 Serial Interface Error Messages Probable Cause Serial Interface Error MessagesModem Communications Error Messages System Status Error Messages System Status Error MessagesTable A-11 Table A-12 Hard Drive Error Messages Probable Cause Hard Drive Error MessagesXx = 03, Hard drive read/write compare test Table A-13 Hard Drive Error Messages Probable Cause Table A-14 Video Graphics Error Messages Probable Cause Audio Error MessagesTable A-15 Audio Error Messages Probable Cause Network Interface Error Messages 17 DVD/CD-ROM Error MessagesDVD/CD-ROM Error Messages Table A-17 Network Interface Error Messages Probable CauseTable A-18 Scsi Interface Error Messages Scsi Interface Error Messages 65xx-xx, 66xx-xxPointing Device Interface Error Messages 8601-xx Error Messages and Codes Numerics IndexIndex
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dc7800 tower specifications

The HP dc7800 Tower is a powerful desktop computer designed for professional and enterprise environments. Known for its stability, performance, and versatility, this model has secured its place in a variety of business settings. Launched in the mid-2000s, it embodies HP’s commitment to quality and innovation.

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