Graphics; Intel 845G Chipset Integrated Graphics - Compaq Evo D310 Micro-Desktop Technical Reference Manual

System Features

Graphics

The Compaq Evo D310 Micro Desktop has an Integrated Intel graphics solution. It also has an AGP slot
where an ATI Radeon 7000 or ATI Radeon 7500 graphics card can be installed:

Intel 845G Chipset Integrated Graphics

The Intel 845G chipset offers integrated graphics with Dynamic Video Memory Technology (DVMT).
Some memory (8MB) is reserved at boot time from the main memory; further memory is allocated as
needed.
Key Features
Dynamic Video Memory Technology: Ensures most efficient system memory usage for optimal 2D/3D
•
graphics and system performance
Zone Rendering Technology: Significantly reduces the memory bandwidth by up to 11x which results
•
in much higher 3D performance
Tiled Memory Addressing: Performs Address Remapping in hardware for all graphics surfaces which
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increases page coherency and improves memory efficiency
Dynamic Multi-Context Switcher: Provides deeply pipelined operations in both 2D and 3D allowing
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overlapping operations with no need to flush between modes of operation
Intelligent Memory Manager: Fourth generation UMA Memory Manager that provides faster accesses,
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adequate burst sizes and smart page closing policies
4x Blit Engine for 2D operations: 256 bit wide Blitter fills at a much greater rate than memory
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bandwidth which speeds up operations like drop down menus
Deep Display Buffers: Buffer for screen refreshes which enables higher system performance by
•
reducing the CPU latency as well as decreasing the total transactions handled by the CPU
Non-blocking and multi-tier cache structures: Dedicated internal caches for textures, colors, Z and
•
vertices which significantly reduces memory bandwidth and improves core performance
Single-Pass Quad Texture Support: Supports up to blending operations for up to four textures in a
•
single pass which reduces memory bandwidth requirements and CPU loading
Texture Decompression: Provide up to 8x compression and consequent reduction in bandwidth and
•
footprint.
Memory Usage with Dynamic Video Memory Technology
At boot time the system BIOS dedicates 8MB of system memory for graphics display. When more memory
is needed the Intel 845 graphics driver submits a request to the operating system, the operating system
grants the request based upon available system memory. When the application is closed, the OS will
reallocate system memory back for generic use. The quantity of additional memory which can be
allocated for video by the operating system is limited, the limit depends on the quantity of memory
installed on the system and on the driver version (the latest drivers can be downloaded from the web).
The quantity of system memory allocated by the BIOS and the maximum limit cannot be modified by the
user.
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