MSI X99S GAMING 9 AC - Manual (Page 33)

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Expansion Slots
This motherboard contains numerous slots for expansion cards, such as discrete
graphics or audio cards.
PCI_E1~5: PCIe Expansion Slots
The PCIe slot supports the PCIe interface expansion card.
PCIe 3.0 x16 Slot
PCIe Bandwidth Table
■ 3.0 = PCIe Gen 3.0 lanes, 2.0 = PCIe Gen 2.0 lanes
Bandwidth
1-Way 2-Way 3-Way 4-Way
CPU
Type
40
lanes
28
lanes
40
lanes
28
lanes
40
lanes
28
lanes
40
lanes
28
lanes
PCI_E1
3.0
x16
3.0
x16
3.0
x16
3.0
x16
3.0 x16 3.0 x8 3.0 x8 3.0 x8
PCI_E2 3.0 x8 3.0 x8 3.0 x8
PCI_E3
PCI_E4
3.0
x16
3.0 x8 3.0 x16 3.0 x8 3.0 x16 3.0 x8
PCI_E5 3.0 x8 3.0 x8 3.0 x4
M.2 3.0 x4 3.0 x4 3.0 x4 3.0 x4 2.0 x2* 3.0 x4 2.0 x2* 2.0 x2*
SATA
Express
2.0 x2 2.0 x2 2.0 x2 2.0 x2 2.0 x2 2.0 x2 2.0 x2 2.0 x2
* When installing the M.2 PCIe interface module, please set the “M.2 PCH Strap” for [M.2 PCIE] in BIOS.
Important
• 28 lanes CPU does not support 4-Way NVIDIA ® SLI ™ Technology.
• For a single PCIe x16 expansion card installation with optimum performance, using
the PCI_E1 slot is recommended.
• When adding or removing expansion cards, always turn off the power supply and
unplug the power supply power cable from the power outlet. Read the expansion
card’s documentation to check for any necessary additional hardware or software
changes.