PCIe riser and adapter installation rules and order (server model with three PCIe risers)
Use the information in this topic to understand installation rules and order for PCIe risers and PCIe adapters in the sever with three PCIe risers.
Note
- PCIe Gen4 risers contain PCIe Gen4 slots only.
- PCIe Gen5 risers contain PCIe Gen4 and Gen5 slots.
- Performance may degrade when a x16 PCIe card is installed in a x8 lane PCIe slot.
- Legacy option ROM boot is only supported on the PCIe adapters installed in the following PCIe slots:
- With PCIe Gen4 risers installed: PCIe slot 1, 2, 3, 5, 8, 9, and 11
- With PCIe Gen5 risers installed: PCIe slot 1, 2, 5, 8, and 11
- The available PCIe slots will depend on the riser and number of processors installed.
- With PCIe Gen4 risers installed:
- With two processors installed: PCIe slot 3, 5, 8, 9, and 11
- With three processors installed: PCIe slot 3, 5, 7, 8, 9, 10, and 11
- With four processors installed: PCIe slot 3 to 11
- With PCIe Gen5 risers installed:
- With two processors installed: PCIe slot 5, 8, and 11
- With three processors installed: PCIe slot 5, 7, 8, 10, and 11
- With four processors installed: PCIe slot 4, 5, 6, 7, 8, 10, and 11
- With PCIe Gen4 risers installed:
- PCIe slot 3 and 4 are unavailable when one of the following PCIe risers is installed:
- 7mm/x16 PCIe G4 Riser 1 FHHL
- 7mm/x16 PCIe G5 Riser 1 FHHL
- PCIe slot 3 and 9 are unavailable when the following PCIe riser is installed:
- x16/x16 PCIe G5 Riser 1/3 FHFL
- PCIe slot 8 is unavailable when one of the following PCIe risers is installed:
- x16/x8/Serial PCIe G4 Riser 2/C HHHL
- x16/x8/Serial PCIe G5 Riser 2/C HHHL
- When a ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM v1 is installed in the system, the maximum number of the following PCIe risers is one.
- x8/x16/x16 PCIe G4 Riser 1/3 FHFL (can only be installed in riser 1)
- x16/x16 PCIe G5 Riser 1/3 FHFL (can only be installed in riser 1)
- When a ThinkSystem Intel E810-DA4 10/25GbE SFP28 4-Port OCP Ethernet Adapter is installed in the system, no other OCP module can be installed.
PCIe riser installation rules and order
| Installation priority | PCIe riser type | Riser location priority |
|---|---|---|
| 1 | 7mm/x16 PCIe G4 Riser 1 FHHL | Riser 1 |
| 2 | 7mm/x16 PCIe G5 Riser 1 FHHL | Riser 1 |
| 3 | x16/x16 PCIe G5 Riser 1/3 FHFL | Riser 1, riser 3 |
| 4 | x8/x16/x16 PCIe G4 Riser 1/3 FHFL | Riser 1, riser 3 |
| 5 |
| Riser 2 |
| 6 |
| Riser 2 |
PCIe adapter installation rules and order
| Installation priority | Component | PCIe slot priority |
|---|---|---|
| 1 | 32i Gen4 RAID adapter | 3, 5, 9, 11 |
| 2 |
|
|
| 3 | ThinkSystem Nvidia PCIe Gen4 x16 Passive Aux Kit | 4 |
| 4 | ThinkSystem NVIDIA ConnectX-7 NDR400 OSFP 1-Port PCIe Gen5 Adapter | 5, 11, 10, 4, 6 |
| 5 | Double-wide GPU | 10, 4 |
| 6 | Single-wide GPU | 10, 4, 3, 9 |
| 7 |
| 5, 11, 10, 4, 6 |
| 8 | ThinkSystem Broadcom 57504 10/25GbE SFP28 4-Port PCIe Ethernet Adapter | 5, 11, 10, 4 |
| 9 |
| 5, 11, 8, 7, 10, 4, 6, 9, 3 |
| 10 | External RAID/HBA adapter | 5, 11, 8, 7, 10, 4 |
| 11 | Management NIC adapter | 1 |
| 12 | OCP module | 1, 2 |
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