ASROCK C621A WS, Manual

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C621A WS
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English
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 Mechanical Electrical Source
PCIE7 4.0 x16 x16 CPU1
PCIE6 4.0 x8 x8 CPU1
PCIE5 4.0 x16 x16 CPU1
PCIE4 4.0 x8 x8 CPU1
PCIE3 4.0 x16 x16 CPU1
PCIE2 4.0 x8 x8 CPU1
PCIE1 4.0 x16 x16 CPU1
PCIe Slot Configurations
PCIE2 PCIE3
Single PCIE Card
N/A x16
Two PCIE Cards x8 x8
PCIE4 PCIE5
Single PCIE Card N/A x16
Two PCIE Cards x8 x8
PCIE6 PCIE7
Single PCIE Card
N/A x16
Two PCIE Cards x8 x8