Asus SABERTOOTH 990FX R2.0 User Manual page 37

VGA
configuration
x16
Single VGA/
(Recommend for
PCIe card
single VGA)
Dual VGA/PCIe
x16
card
3-way SLI
x16
• 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 sufficient 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
PCIe x16_1
PCIe x16_2
PCIe x16_3
PCIe x16_4
PCIe x1_1
ASM eSATA
ASM SATA [Gray]
ASM USB3_12
ASM 1042 (Front)
ASM USB3_3
Realtek 8111F (LAN)
Onchip SATA [Brown]
Onchip Audio
Onchip USB2_1-5
Onchip USB2_6-8
Onchip USB2_11-14
ASUS SABERTOOTH 990FX R2.0
PCI Express operating mode
PCIe PCIe
2.0_x16_1 2.0_x16_2
x4
x4
x4
A B C
shared – –
shared – –
shared – –
– – –
– – –
– – –
– – –
– – –
– – –
shared – –
– – –
– – –
shared – –
– shared –
– – –
– – –
PCIe
2.0x16_3
N/A
x16
x8
D E F
– – –
– – –
– – –
– shared –
– shared –
– shared –
– – –
– – –
– – –
– – –
– – shared
shared – –
– – –
– – –
– – shared
– – –
PCIe
2.0x16_4
x8
x1
x8
G H
– –
– –
– –
– –
– –
– –
shared –
shared –
– shared
– –
– –
– –
– –
– –
– –
– shared
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