Front backplanes: 24 x NVMe

This topic provides cable routing information for the 24 x 2.5" NVMe (Gen 5) configuration with one or two retimer cards.

Connections between connectors: 1 ↔ 1, 2 ↔ 2, 3 ↔ 3, ... n ↔ n

Onboard connectors + One retimer card​

Figure 1. NVMe cable routing to onboard connectors and retimer card

From	To
1 Backplane 1: NVMe 0-1	Onboard: PCIe 10
2 Backplane 1: NVMe 2-3	Onboard: PCIe 9
3 Backplane 1: NVMe 4-5	Onboard: PCIe 8
4 Backplane 1: NVMe 6-7	Onboard: PCIe 7
5 Backplane 2: NVMe 0-1	Onboard: PCIe 6
6 Backplane 2: NVMe 2-3	Onboard: PCIe 5
7 Backplane 2: NVMe 4-5, 6-7	Onboard: PCIe 3, 4
8 Backplane 3: NVMe 0-1	Onboard: PCIe 2
9 Backplane 3: NVMe 2-3	Onboard: PCIe 1
10 Backplane 3: NVMe 4-5	Retimer: C0
11 Backplane 3: NVMe 6-7	Retimer: C1

Onboard connectors + Two retimer cards​

Figure 2. NVMe cable routing to onboard connectors and two retimer cards

From	To
1 Backplane 1: NVMe 0-1	Onboard: PCIe 10
2 Backplane 1: NVMe 2-3	Onboard: PCIe 9
3 Backplane 1: NVMe 4-5	Retimer: C0
4 Backplane 1: NVMe 6-7	Retimer: C1
5 Backplane 2: NVMe 0-1	Onboard: PCIe 7
6 Backplane 2: NVMe 2-3	Onboard: PCIe 3
7 Backplane 2: NVMe 4-5	Onboard: PCIe 6
8 Backplane 2: NVMe 6-7	Onboard: PCIe 5
9 Backplane 3: NVMe 0-1	Onboard: PCIe 2
10 Backplane 3: NVMe 2-3	Onboard: PCIe 1
11 Backplane 3: NVMe 4-5	Retimer: C0
12 Backplane 3: NVMe 6-7	Retimer: C1