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La nascita di queste nuove schede video, è stata concepita grazie all’acquisizione di ATI da parte di AMD. Il ritardo, però, nell’uscita del mercato informatico in ritardo ha comportato di essere in ritardo rispetto alle altre case produttrici di case madri.
Non si sanno le vere ragioni per cui AMD ha lanciato il progetto R600 con un ritardo di 4-6 mesi. Sembrerebbe che questo ritardo sia stato dovuto a un problema di marketing ( ovvero che AMD aspettava il lancio di prodotti con una grafica che fosse integrata al chipset adatto per questa scheda).
Radeon Hd 2900 XT è una scheda madre che può essere integrata sia in pc portatili,che pc fissi.
La Radeon HD 2900 XT è però una scheda che è stata costruita troppo ritardo portandolo ormai ad essere ” vecchia ” rispetto alle sue diretti concorrenti.
Oltretutto, dalle prime impressioni sembrerebbe che la scheda HD 2900 XT, deluderà in molti, a causa del prezzo troppo alto rispetto concorrente Nvidia 8800 GTS ed alcuni problemi che sono già stati riscontrati testando questa scheda grafica e che approndiremo più avanti in questo articolo.
Caratteristiche tecniche
700 milioni di transistors con processo produttivo a 80nm.
512-bit 8-channel GDDR3/4 memory interface
Ring Bus Memory Controller
Fully distributed design with 1024-bit internal ring bus for memory reads and writes
Optimized for high performance HDR (High Dynamic Range) rendering at high display resolutions
Unified Superscalar Shader Architecture
320 stream processing units
Dynamic load balancing and resource allocation for vertex, geometry, and pixel shaders
Common instruction set and texture unit access supported for all types of shaders
Dedicated branch execution units and texture address processors
128-bit floating point precision for all operations
Command processor for reduced CPU overhead
Up to 80 texture fetches per clock cycle
Up to 128 textures per pixel
Fully associative multi-level texture cache design
DXTC and 3Dc+ texture compression
High resolution texture support (up to 8192 x 8192)
Fully associative texture Z/stencil cache designs
Double-sided hierarchical Z/stencil buffer
Early Z test, Re-Z, Z Range optimization, and Fast Z Clear
Lossless Z & stencil compression (up to 128:1)
Lossless color compression (up to 8:1)
8 render targets (MRTs) with anti-aliasing support
Physics processing support
Full support for Microsoft DirectX 10
Shader Model 4.0
Geometry Shaders
Stream Output
Integer and Bitwise Operations
Alpha to Coverage
Constant Buffers
State Objects
Texture Arrays
Dynamic Geometry Acceleration
High performance vertex cache
Programmable tessellation unit
Accelerated geometry shader path for geometry amplification
Memory read/write cache for improved stream output performance
Anti-aliasing features
Multi-sample anti-aliasing (up to 8 samples per pixel)
Up to 24x Custom Filter Anti-Aliasing (CFAA) for improved quality
Adaptive super-sampling and multi-sampling
Temporal anti-aliasing
Gamma correct
Super AA (CrossFire configurations only)
All anti-aliasing features compatible with HDR rendering
Texture filtering features
2x/4x/8x/16x high quality adaptive anisotropic filtering modes (up to 128 taps per pixel)
128-bit floating point HDR texture filtering
Bicubic filtering
sRGB filtering (gamma/degamma)
Percentage Closer Filtering (PCF)
Depth & stencil texture (DST) format support
Shared exponent HDR (RGBE 9:9:9:5) texture format support
CrossFire Multi-GPU Technology
Scale up rendering performance and image quality with 2 or more GPUs
Integrated compositing engine
High performance dual channel interconnect
ATI Avivo HD Video and Display Platform
Two independent display controllers
Drive two displays simultaneously with independent resolutions, refresh rates, color controls and video overlays for each display
Full 30-bit display processing
Programmable piecewise linear gamma correction, color correction, and color space conversion
Spatial/temporal dithering provides 30-bit color quality on 24-bit and 18-bit displays
High quality pre- and post-scaling engines, with underscan support for all display outputs
Content-adaptive de-flicker filtering for interlaced displays
Fast, glitch-free mode switching
Hardware cursor
Two integrated dual-link DVI display outputs
Each supports 18-, 24-, and 30-bit digital displays at all resolutions up to 1920×1200 (single-link DVI) or 2560×1600 (dual-link DVI)
Each includes a dual-link HDCP encoder with on-chip key storage for high resolution playback of protected content2
Two integrated 400 MHz 30-bit RAMDACs
Each supports analog displays connected by VGA at all resolutions up to 2048×15363
HDMI output support
Supports all display resolutions up to 1920×10801
Integrated HD audio controller with multi-channel (5.1) AC3 support, enabling a plug-and-play cable-less audio solution
Integrated Xilleon HDTV encoder
Provides high quality analog TV output (component/Svideo/composite)
Supports SDTV and HDTV resolutions
Underscan and overscan compensation
HD decode acceleration for H.264/AVC, VC-1, DivX and MPEG-2 video formats
Flawless DVD, HD DVD, and Blu-Ray playback
Motion compensation and IDCT (Inverse Discrete Cosine Transformation)
HD video processing
Advanced vector adaptive per-pixel de-interlacing
De-blocking and noise reduction filtering
Edge enhancement
Inverse telecine (2:2 and 3:2 pull-down correction)
Bad edit correction
High fidelity gamma correction, color correction, color space conversion, and scaling
MPEG-2, MPEG-4, DivX, WMV9, VC-1, and H.264/AVC encoding and transcoding
Seamless integration of pixel shaders with video in real time
VGA mode support on all display outputs
PCI Express x16 bus interface
OpenGL 2.0 support