ASROCK X99 OC Formula/3.1 Manual Del Usuario página 22

PCIe Slot Conigurations (For CPU with 28 PCIe lanes)
Single Graphics Card
Two Graphics Cards in
CrossFireX
Mode
hree Graphics Cards in
3-Way CrossFireX
or 3-Way SLI
*4-Way CrossFireX
For a better thermal environment, please connect a chassis fan to the motherboard's chas-
sis fan connector (CHA_FAN1, CHA_FAN2 or CHA_FAN3) when using multiple graphics
cards.
20
PCIE1
x16
TM TM
x16
or SLI
TM
x8
Mode
TM
Mode
TM TM
and 4-Way SLI are not supported for CPU with 28 PCIe lanes.
PCIE2 PCIE3 PCIE4
N/A N/A
N/A N/A
x8 N/A
PCIE5
N/A N/A
x8 N/A
x8 N/A