It is down to costs etc. Bottom line is that if you have the cash then Dual SLI ATI 5970 cards are the fastest thing on the planet. Check out the number of processing cores alone.
The fastest graphics card on the planet, the ATI Radeon HD 5970 delivers an unrivaled HD gaming experience so you can play the latest, most demanding HD titles like never before. Engineered for speed, this next-generation powerhouse delivers unprecedented performance straight out of the box. Unlocked, this graphics card has massive headroom so you can take control and push your hardware to its full potential! Expand your visual real estate across up to three displays and get lost in the action with ATI Eyefinity Technology. Using ATI Stream technology, accelerate even the most demanding applications and do more than ever with your PC. Among the first to deliver full support for Microsoft DirectX 11, these GPUs enable rich, realistic visuals with explosive performance so you can dominate your gaming competition.
Now bundled with an XFX exclusive OverVolt Tool. Take charge of the GPU and memory voltages with an exclusive performance enhancing tool only available for use with the XFX HD 5970 Black Edition. With this tool, you can push the GPU up to 1.0GHz and 6.0GHz for memory.* Product registration required to access this tool and the power to fine tune the voltage settings and unleash the performance limits.
- Core Clock: 725MHz (Up to 1.0GHz with OverVolt Tool)
- Memory: 2048MB GDDR5
- Memory Clock: 4000MHz (Effective) (Up to 6.0GHz with OverVolt Tool)
- Memory Bandwidth: 256GB/s
- Processing Cores: 3200
- Bus Type: PCI-Express 2.1
- Display Connectors: 2 Dual-Link DVI-I & 1 Mini DisplayPort
- HDCP Capable
- DirectX 11 Support
- OpenGL 3.2 Support
- ATI CrossFireX Ready
- ATI Eyefinity Technology
- ATI Avivo HD
- ATI Stream Technology