Pcie Bifurcation Settings - Supermicro SuperServer SYS-621C-TN12R User Manual

PCIe Bifurcation Settings

By default, the BIOS will set bifurcation according to the detected PCIe card. Bifurcation
settings can be found in the BIOS under Advanced > Chipset Configuration > North
Bridge > IIO Configuration > CPU1/CPU2 Configuration. Before modifying bifurcation
settings, verify that the riser card cables (if any) are connected correctly, as described in the
riser card cable routing table.
Motherboard connectors JPCIE1 to 4 can provide PCIe lanes to the riser cards or support
more NVMe drives. For NVMe, refer to
If the system configuration deviates from the standard supported setup—for example different
riser cards or NVMe routing—bifurcation may need to be set manually.
CPU PCIe Port Motherboard Connectors
IOU0 JPCIE1 and 2
IOU1 JLUIO2
CPU1 IOU2 JAIOM1
IOU3 JNVME1 to 4
IOU4 M.2-C1 and C2
IOU0 JAIOM2
IOU1 JRUIO2
CPU2
IOU2 JPCIE3 and 4
IOU3 No connection
IOU4 JVNME5 to 8
Chapter 3: Maintenance and Component Installation
data cable routing
BIOS IIO Mapping to Motherboard
To
RSC-D2-666G5 (rear slots 1, 2); or additional NVMe
RSC-D2-666G5 (rear slot 3)
AIOM slot P1 AIOM
Four NVME ports from CPU 1; or additional PCIe
Two M.2 80 mm from CPU 1
AIOM slot P2-AIOM
RSC D2R 666G5 (rear slot 6)
RSC-D2R-666G5 (rear slots 4, 5) or additional NVME
No connection
Four NVMe ports from CPU 2; or additional PCIe
66
table.