Alienware's Dual PCI-E Graphics System Uncovered @ PCPer
 Quote:
Typically, the screen is divided into two horizontal halves. The job of rendering each portion is then dictated to the appropriate card by a “video merger hub”. This hardware component is able to take signals from the default video drivers and can allocate responsibilities to either graphics card. Overall, the separation of workload is hoped to increase performance more than 40% over typical platforms in most applications. This performance advantage is said to increase according to how taxing the application may be. Doom 3 and Half-Life 2 fans rejoice as this new system seems custom tailored to these titles.
| http://www.pcper.com/article.php?aid=43 | 