Asus P5N-E SLI - Manual (Page 116)

3-14 Chapter 3: Software support
Enabling the multi-GPU feature in Windows
After installing your graphics cards and the device drivers, enable
the Multi-Graphics Processing Unit (GPU) feature in the NVIDIA nView
properties.
To enable the multi-GPU feature:
1. Click the NVIDIA Settings icon
on your Windows taskbar.
2. From the pop-up menu, select
nView Desktop Manager then
click nView Properties.
3. From the nView Desktop Manager
window, select the Desktop
Management tab.
4. Click Properties to display the
Display Properties dialog box.
NVIDIA Settings icon