Asus Crosshair II Formula - Manual (Page 48)

2-22 Chapter 2: Hardware information
• We recommend that you install a VGA card to the primary (blue) PCI
Express x16 slots, and install any other PCI Express device to the universal
(white) PCI Express x16 slot.
• Currently, only NVIDIA ® SLI™-Ready GeForce ® 8800 Ultra and GeForce ®
8800 GTX graphics cards support 3-Way SLI™ mode.
• 3-Way SLI™ mode is supported by Windows ® Vista OS only. For more
information, go to NVIDIA ® official website (www.nvidia.com).
• Currently, only NVIDIA ® GeForce ® 8500 GT and GeForce ® 8400 GS
graphics cards support GeForce Boost function under Hybrid SLI™ mode.
• Currently, only NVIDIA ® GeForce ® 9800 GX2 and GeForce ® 9800 GTX
graphics cards support Hybrid Power function under Hybrid SLI™ mode.
• Hybrid SLI™ mode is supported by Windows ® Vista OS only. For more
information, go to www.nvidia.com/hybridsli.
• Before enabling the HybridPower™ function, ensure that you have
connected your display to the onboard VGA port or the HDMI/DVI port at
the rear panel. Refer to 2.8.1 Rear panel connectors for details.
• Connect a rear chassis fan to the motherboard connector labeled
OPT_FAN1/2 when using multiple graphics cards for better thermal
environment. See page 2-32 for details.
• We recommend that you provide sufficient power when running NVIDIA ®
SLI™ mode. See page 2-34 for details.
Primary PCI Express x16 slots
The primary PCI Express x16 slots support PCI Express x16 graphics cards that
comply with the PCI �xpress specifications.
Universal PCI Express x16 slots (max. x8 mode)
This motherboard also supports universal PCI Express x16 slots with a maximum
speed of 8 GB/s. The operating frequency of this slot changes, depending on the
type of PCI Express card you install. Refer to the table below for details.
VGA configuration
PCI Express operating mode
PCIex16_1 PCIex16_2 PCIex16_3
Single VGA/PCIe card x16 x8 x16
Dual VGA/PCIe card x16 N/A x16
Triple VGA/PCIe card x16 x8 x8
When running 3-Way SLI™ mode, the PCIe operating frequency will reach x8,
x8, x8.