Introduction

Together with the Radeon X1950 XTX, ATI introduced additional new cards at the same time: the X1300 XT and the X1650 XT. Today we will take a look at the X1300 XT.
This refresh introduces a new GPU into the X1300 product lineup. In the past only the RV515 GPU has been used. On the X1300 XT the RV530 is in use which was limited to the X1600 series until now. This means that the performance of the X1300 XT should be a lot closer to X1600 levels. This performance upgrade makes sense because NVIDIA has several products directly competing with the X1300 and the RV515 is slower than many of these cards.


The card tested here is Sapphire's Overclocked Edition X1300 XT. This means that the clock speeds have been increased on both the core and the memory to bring them closer to the X1600. Also the memory type has been bumped to GDDR3.

Complete Specifications

Features

• 105 million transistors on 90nm fabrication process
• Four pixel shader processors
• Two vertex shader processors
• 128-bit 4-channel DDR/DDR2/GDDR3 memory interface
• 32-bit/1-channel, 64-bit/2-channel, and 128-bit/4-channel configurations
• Native PCI Express x16 bus interface
• AGP 8x configurations also supported with external bridge chip
• Dynamic Voltage Control

High Performance Memory Controller

• Fully associative texture, color, and Z/stencil cache designs
• Hierarchical Z-buffer with Early Z test
• Lossless Z Compression (up to 48:1)
• Fast Z-Buffer Clear
• Z/stencil xache optimized for real-time shadow rendering

Ultra-Threaded Shader Engine

• Support for Microsoft® DirectX® 9.0 Shader Model 3.0 programmable vertex and pixel shaders in hardware
• Full speed 128-bit floating point processing for all shader operations
• Up to 128 simultaneous pixel threads
• Dedicated branch execution units for high performance dynamic branching and flow control
• Dedicated texture address units for improved efficiency
• 3Dc+ texture compression
• High quality 4:1 compression for normal maps and two-channel data formats
• High quality 2:1 compression for luminance maps and single-channel data formats
• Multiple Render Target (MRT) support
• Render to vertex buffer support
• Complete feature set also supported in OpenGL® 2.0

Advanced Image Quality Features

• 64-bit floating point HDR rendering supported throughout the pipeline
• Includes support for blending and multi-sample anti-aliasing
• 32-bit integer HDR (10:10:10:2) format supported throughout the pipeline
• Includes support for blending and multi-sample anti-aliasing
• 2x/4x/6x Anti-Aliasing modes
• Multi-sample algorithm with gamma correction, programmable sparse sample patterns, and centroid sampling
• New Adaptive Anti-Aliasing feature with Performance and Quality modes
• Temporal Anti-Aliasing mode
• Lossless Color Compression (up to 6:1) at all resolutions, including widescreen HDTV resolutions
• 2x/4x/8x/16x Anisotropic Filtering modes
• Up to 128-tap texture filtering
• Adaptive algorithm with Performance and Quality options
• High resolution texture support (up to 4k x 4k)

Avivo™ Video and Display Platform

• High performance programmable video processor
• Accelerated MPEG-2, MPEG-4, DivX, WMV9, VC-1, and H.264 decoding and transcoding
• DXVA support
• De-blocking and noise reduction filtering
• Motion compensation, IDCT, DCT and color space conversion
• Vector adaptive per-pixel de-interlacing
• 3:2 pulldown (frame rate conversion)
• Seamless integration of pixel shaders with video in real time
• HDR tone mapping acceleration
• Maps any input format to 10 bit per channel output
• Flexible display support
• Dual integrated DVI transmitters (one dual-link + one single-link)
• DVI 1.0 compliant / HDMI interoperable and HDCP ready*
• Dual integrated 10 bit per channel 400 MHz DACs
• 16 bit per channel floating point HDR and 10 bit per channel DVI output
• Programmable piecewise linear gamma correction, color correction, and color space conversion (10 bits per color)
• Complete, independent color controls and video overlays for each display
• High quality pre- and post-scaling engines, with underscan support for all outputs
• Content-adaptive de-flicker filtering for interlaced displays
• Xilleon™ TV encoder for high quality analog output
• YPrPb component output for direct drive of HDTV displays**
• Spatial/temporal dithering enables 10-bit color quality on 8-bit and 6-bit displays
• Fast, glitch-free mode switching
• VGA mode support on all outputs
• Drive two displays simultaneously with independent resolutions and refresh rates
• Compatible with ATI TV/Video encoder products, including Theater 550

CrossFire

• Multi-GPU technology
• Inter-GPU communication over PCI Express (no interlink hardware required)
• Four modes of operation:
• Alternate Frame Rendering (maximum performance)
• Supertiling (optimal load-balancing)
• Scissor (compatibility)
• Super AA 8x/10x/12x/14x (maximum image quality)