I was seeking to upgrade from a troublesome Nvidia card so I could watch online video from you tube and other sources. I selected this card based on a collegues recommendation of ATI products and I am happy to say, this card has been excellent. Be advised ATI actually makes their own cards under the Radeon name but they also license out their technology to 2nd level players.

My PC runs Win XP pro SP3.

Specs:
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 512 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 CrossFire™
Multi-GPU technology
Four modes of m./operation:
Alternate Frame Rendering (maximum performance)
Supertiling (optimal load-balancing)
Scissor (compatibility)
Super AA 8x/10x/12x/14x (maximum image quality) 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 4)

Installation was very easy. I pulled the plug on the old Nvidia card, installed this one in the AGP slot, booted up the PC. Basic VGA drivers are loaded so you can see the screen. Next, cancel the "found hardware wizard" and run the setup off the supplied ATI driver CD.Next, I followed the standard install which includes the Catalyst software program to fine tune your display based on your system resources, ie fast or slow processor, memory available, front side bus. I set mine to run full tilt quality and my display is brighter and sharper than ever.You will be able to run full hardware Direct X 9.0 without stuttering or the green screen lockup that is so common with Nvidia cards. For gamers, this is a plus. I don't do online gaming so I cannot comment on how hard this card can be pushed. For basic PC use and watching video online or via a MPG or DVD, this card performs flawlessly.

One drawback to this card is the fact is needs its own power supply feed from your PC PSU. You need to find out what wattage output you currenty have and also if you have an extra molex connector to plug into the back of the card. ATI recommends you come straight off the PSU and not run a daisy chain setup. My pc had a 300w PSU and ATI stated minimum is 350 so I replaced my stock PSU with a 500W Thermaltake unit and connected the card directly to the extra molex connector coming off the PSU.

ATI specs below for installation are

Minimum System Requirements
AGP 8X graphics slot available on motherboard
350-Watt power supply or greater recommended (assumes fully loaded system)
256 MB minimum system memory
Installation software requires CD-ROM drive
DVD playback requires DVD drive and decoder software (not included) Operating Systems Support:
- Windows® XP
- Windows® XP x64 Edition
- Windows® Media Center Edition 2005
- Windows® Vista

This card also provides an S-video output as well as the standard VGA and DVI outputs. I use the DVI with my I-INC 19 widescreen LCD