Expansion Slots (Pci Express Slots) - ASROCK C621A WS Manual

2.5 Expansion Slots (PCI Express Slots)

There are 7 PCIe slots on this motherboard.
PCIE slot:
PCIE1, PCIE3, PCIE5 and PCIE7 (PCIE 4.0 x16 slot, from CPU1) are used for PCIe x16
lane width cards.
PCIE2, PCIE4 and PCIE6 (PCIE 4.0 x8 slot, from CPU1) are used for PCIe x8 lane width
cards.
Slot Generation
PCIE7 4.0
PCIE6 4.0
PCIE5 4.0
PCIE4 4.0
PCIE3 4.0
PCIE2 4.0
PCIE1 4.0
PCIe Slot Configurations
Single PCIE Card
Two PCIE Cards
Single PCIE Card
Two PCIE Cards
Single PCIE Card
Two PCIE Cards
Mechanical Electrical
x16 x16
x8 x8
x16 x16
x8 x8
x16 x16
x8 x8
x16 x16
PCIE2
N/A
x8
PCIE4
N/A
x8
PCIE6
N/A
x8
C621A WS
Source
CPU1
CPU1
CPU1
CPU1
CPU1
CPU1
CPU1
PCIE3
x16
x8
PCIE5
x16
x8
PCIE7
x16
x8
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