Asus X99-PRO USB 3.1 User Guide - Page 32
Expansion slots, Slot No., Slot Description
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1.2.5 Expansion slots Unplug the power cord before adding or removing expansion cards. Failure to do so may cause you physical injury and damage motherboard components. Chapter 1 Slot No. 1 2 3 4 5 6 40-LANE PCIe 3.0/2.0 x16_1 slot PCIe 2.0 x1_1 slot PCIe 2.0 x16_2 slot PCIe 3.0/2.0 x16_3 slot PCIe 2.0 x1_2 slot PCIe 3.0/2.0 x16_4 slot Slot Description 28-LANE PCIe 3.0/2.0 x16_1 slot PCIe 2.0 x1_1 slot PCIe 2.0 x16_2 slot PCIe 3.0/2.0 x16_3 slot PCIe 2.0 x1_2 slot PCIe 3.0/2.0 x16_4 slot 1-16 Chapter 1: Product introduction
![](/manual_guide/products/asus-x99pro-usb-31-user-guide-f03a6b7/32.png)
1-16
Chapter 1: Product introduction
Chapter 1
1.2.5
Expansion slots
Unplug the power cord before adding or removing expansion cards. Failure to do so may
cause you physical injury and damage motherboard components.
Slot No.
Slot Description
40-LANE
28-LANE
1
PCIe 3.0/2.0 x16_1 slot
PCIe 3.0/2.0 x16_1 slot
2
PCIe 2.0 x1_1 slot
PCIe 2.0 x1_1 slot
3
PCIe 2.0 x16_2 slot
PCIe 2.0 x16_2 slot
4
PCIe 3.0/2.0 x16_3 slot
PCIe 3.0/2.0 x16_3 slot
5
PCIe 2.0 x1_2 slot
PCIe 2.0 x1_2 slot
6
PCIe 3.0/2.0 x16_4 slot
PCIe 3.0/2.0 x16_4 slot