ASROCK Fatal1ty X299 Professional Gaming i9 XE Series Manual page 25

PCIe Slot Configurations (For CPU with 28 PCIe lanes)
Single Graphics Card
Two Graphics Cards in
TM
CrossFireX or SLI
Mode
Three Graphics Cards in
3-Way CrossFireX
TM
or 3-Way SLI
PCIe Slot Configurations (For CPU with 16 PCIe lanes)
Single Graphics Card
Two Graphics Cards in
TM
CrossFireX
For a better thermal environment, please connect a chassis fan to the motherboard's |
chassis fan connector (CHA_FAN1, CHA_FAN2 or CHA_FAN3) when using multiple
graphics cards.
* If you install CPU with 44 or 28 lanes and encounter CrossFire issues, please
do the followings.
1. Enter UEFI by pressing <F2> or <Del> during system startup.
2. Select "Boot > CSM" from the menu.
3. Set "Launch Storage OpROM policy" to "UEFI only".
4. Press F10 to Save and Exit.
22
PCIE1
x16
TM
x16
TM
Mode x8
Mode
PCIE1
x16
x8
Mode
PCIE2 PCIE3 PCIE4
N/A N/A
N/A x8
N/A x8
PCIE2 PCIE3 PCIE4
N/A N/A
N/A x4
PCIE5 M2_1
N/A N/A x4
N/A N/A x4
N/A x8 x4
PCIE5 M2_1
N/A N/A
N/A N/A
x0
x4