Riser 3 cage

This section provides cable routing information for riser 3 cages.

The following illustrations show the PCIe riser 3 cages. The riser card types vary by server model. For detailed information, see PCIe slots and PCIe adapters.

Gen 4 riser 3 cage	Gen 5 riser 3 cage

Riser card 3 power and sideband connection (Gen 4/Gen 5)​

The power and sideband connections for x8/x8 PCIe riser card 3 and x16/x16 PCIe riser card 3 are the same.

Figure 1. Riser card 3 power and sideband connection

From	To
1 Power connector on the riser card	1 Riser 3 power connector on the system board assembly
2 Sideband connector on the riser card	2 Riser 3 sideband connector on the system board assembly

Riser card 3 (x8/x8 Gen 4 PCIe) signal cable connection​

Figure 2. Cable routing when two processors installed		Figure 3. Cable routing when one processor installed
From	To	From	To
1 MCIO 1 on the riser card	1Onboard: PCIe 9	1 MCIO 1 on the riser card	1Onboard: PCIe 9
2 MCIO 2 on the riser card	2Onboard: PCIe 8	2 MCIO 2 on the riser card	2Onboard: PCIe 10, 11

Riser card 3 (x16/x16 Gen 4 PCIe) signal cable connection​

Figure 4. Signal cable connections for the x16/x16 Gen 4 PCIe riser card 3

From	To
1 MCIO 1 on the riser card	1Onboard: PCIe 9
2 MCIO 2 on the riser card	2Onboard: PCIe 8
3 MCIO 3 on the riser card	3Onboard: PCIe 6
4 MCIO 4 on the riser card	4Onboard: PCIe 10, 11

Riser card 3 (x8/x8 Gen 5 PCIe) signal cable connection​

Figure 5. Cable routing when two processors installed		Figure 6. Cable routing when one processor installed
From	To	From	To
1 MCIO 1 on the riser card	1Onboard: PCIe 6	1 MCIO 1 on the riser card	1Onboard: PCIe 9
2 MCIO 3 on the riser card	2Onboard: PCIe 10, 11	2 MCIO 3 on the riser card	2Onboard: PCIe 10, 11

Riser card 3 (x16/x16 Gen 5 PCIe) signal cable connection​

Figure 7. Signal cable connections for the x16/x16 Gen 5 PCIe riser card 3

From	To
1 MCIO 1 on the riser card	1Onboard: PCIe 6
2 MCIO 2 on the riser card	2Onboard: PCIe 8
3 MCIO 3 on the riser card	3Onboard: PCIe 10, 11
4 MCIO 4 on the riser card	4Onboard: PCIe 9