Here is some info right off the ATI website. Target edits are green.

Radeon® X850 XT 256MB PCI Express® + FREE SHIPPING
Price: $399.00

Stock : In Stock Part Number: 100435427

The Radeon® X850 XT graphics card is designed for extreme gaming performance with 16 pipelines, incredible frame rates and ATI's industry-leading 3D image enhancement technology. The Radeon® X850 XT delivers further on the promise of High-Definition Gaming.

Features This is Marketing stuff
Extreme Gaming
Brilliant image quality and no compromise in performance for serious gamers.
CrossFire™ Radey
CrossFire™ ignites an entirely new gaming experience by accelerating all your games, all the time, with the power of multiple GPUs within a single PC. Ultimate Stability & Control Featuring ATI’s Catalyst™ Control Center, a powerful and easy to use graphics configuration tool.
Specifications Pipes and Ram Speed!
16 parallel rendering pipelines
256MB GDDR3 memory
PCI Express® native X16 lanes support
Direct X® 9.0 and OpenGL® 2.0 support more junk
SmartShader™ HD technology SmoothVision™ HD technology
VideoShader™ HD technology Hyper Z™ HD technology
3Dc™ Support DVD video playback S-video and composite video output
HDTV Support
System Requirements Note the power requirements!
PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard and one additional adjacent expansion slot
Connection to the system power supply is required. The power supply should have a specialized 12V graphics card power connector (adapter included)
350-Watt power supply or greater recommended
256MB of system memory
Installation software requires CD-ROM drive
DVD playback requires DVD drive
Graphics Technology This is what is know as the core
Radeon® X850 XT Graphics Processing Unit (GPU)
Memory Configuration
256MB GDDR3 memory
256-bit memory interface
Operating Systems
Windows® XP (Home or Professional)
Windows® XP x64 Edition Windows® Media Center Edition Windows® 2000 with Service Pack 1 (or later) Warranty 3-year limited Display Support DVI-I connector for digital CRTs or flat panels VGA connector for analog displays S-Video/Composite Video In/Video Out adapter cable Drive two displays simultaneously with independent resolutions and refresh rate