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ASUS SABERTOOTH 990FX R2.0
1-23
Chapter 1
• In single VGA card mode, use the PCIe 2.0 x16_1 slot (beige) for a PCI Express x16
graphics card to get better performance.
• In CrossFireX™ or SLI™ mode, use the PCIe 3.0 x16_1 and PCIe 3.0 x16_3 slots for
PCI Express x16 graphics cards to get better performance.
• In 3-way SLI mode, use the PCIe 3.0 x16_1/PCIe 3.0 x16_3/PCIe 3.0 x16_4 slots for
PCI Express x16 graphic cards to get better performance.
• We recommend that you provide sufcient power when running CrossFireX™ or SLI™
mode.
• Connect a chassis fan to the motherboard connector labeled CHA_FAN1/2 when
using multiple graphics cards for better thermal environment.
IRQ assignments for this motherboard
A B C D E F G H
PCIe x16_1 shared – – – – – – –
PCIe x16_2 shared – – – – – – –
PCIe x16_3 shared – – – – – – –
PCIe x16_4 – – – – shared – – –
PCIe x1_1 – – – – shared – – –
ASM eSATA – – – – shared – – –
ASM SATA [Gray] – – – – – – shared –
ASM USB3_12 – – – – – – shared –
ASM 1042 (Front) – – – – – – – shared
ASM USB3_3 shared – – – – – – –
Realtek 8111F (LAN) – – – – – shared – –
Onchip SATA [Brown] – – – shared – – – –
Onchip Audio shared – – – – – – –
Onchip USB2_1-5 – shared – – – – – –
Onchip USB2_6-8 – – – – – shared – –
Onchip USB2_11-14 – – – – – – – shared
VGA
conguration
PCI Express operating mode
PCIe
2.0_x16_1
PCIe
2.0_x16_2
PCIe
2.0x16_3
PCIe
2.0x16_4
Single VGA/
PCIe card
x16
(Recommend for
single VGA)
x4 N/A x8
Dual VGA/PCIe
card
x16 x4 x16 x1
3-way SLI x16 x4 x8 x8