Asus Motherboard A8N-SLI SE - Manual (Page 146)

6-2 Chapter 6: NVIDIA ® SLI™ technology support
6.2.1 Installing SLI-ready graphics cards
Goldfingers
Install only identical SLI-ready graphics cards that are ASUS and NVIDIA ®
certified. Different types of graphics cards will not work together
properly.
To install the graphics cards:
1. Prepare two graphics cards. Each graphics card should have
goldfingers for the SLI connector.
2. Remove the metal bracket covers opposite the two PCI Express x16
slots.
6.2 Dual graphics card setup