Rear view

• Server model with three PCIe slots

• Server model with two PCIe slots

• Server model with two 2.5-inch hot-swap rear drive bays and one PCIe slot

• Server model with two 7mm hot-swap rear drive bays and two PCIe slots

• Server model with two 7mm hot-swap rear drive bays and one PCIe slot

• Server model with two PCIe slots and a direct water cooling module

Server model with three PCIe slots​

The following illustration shows the rear view of server model with three PCIe slots. Depending on the model, your server might look slightly different from the illustration below.

Figure 1. Rear view with 3 low profile PCIe adapters

Table 1. Components on the rear of the server

Callout	Callout
1 PCIe slot 1 on riser 1 assembly	2 PCIe slot 2 on riser 1 assembly
3 PCIe slot 3 on riser 2 assembly	4 Power supply 2 (optional)
5 Power supply 1	6 NMI button
7 USB 3.1 Gen 1 (5Gbps) connectors (3 DCIs)	8 VGA connector
9 XClarity Controller network connector	10 Ethernet connectors of the OCP module on the rear (optional, two or four connectors may be available)

Server model with two PCIe slots​

The following illustration shows the rear views of the server model with two PCIe slots. Depending on the model, your server might look slightly different from the illustration below.

Figure 2. Rear view with 1 low profile PCIe adapter, 1 full height PCIe adapter, and 1 filler

Table 2. Components on the rear of the server

Callout	Callout
1 PCIe slot 1 on riser 1 assembly	2 PCIe slot 2 on riser 1 assembly
3 Power supply 2 (optional)	4 Power supply 1
5 NMI button	6 VGA connector
7 USB 3.1 Gen 1 (5Gbps) connectors (3 DCIs)	8 XClarity Controller network connector
9 Ethernet connectors of the OCP module on the rear (optional, two or four connectors may be available)

Server model with two 2.5-inch hot-swap rear drive bays and one PCIe slot​

The following illustration shows the rear view of the server model with two hot-swap drive bays and one PCIe slot. Depending on the model, your server might look slightly different from the illustration below.

Table 5. Components on the rear of the server

1 PCIe slot 1 on riser 1 assembly	2 Rear 2.5-inch drive bays (2)
3 Power supply 2 (optional)	4 Power supply 1
5 NMI button	6 VGA connector
7 USB 3.1 Gen 1 (5Gbps) connectors (3 DCIs)	8 XClarity Controller network connector
9 Ethernet connectors of the OCP module on the rear (optional, two or four connectors may be available)

Server model with two 7mm hot-swap rear drive bays and two PCIe slots​

The following illustration shows the rear view of the server model with two 7mm hot-swap rear drive bays and two PCIe slots. Depending on the model, your server might look slightly different from the illustration below.

Table 6. Components on the rear of the server

1 PCIe slot 1 on riser 1 assembly	2 PCIe slot 2 on riser 1 assembly
3 Rear 7mm drive bays (2)	4 Power supply 2 (optional)
5 Power supply 1	6 NMI button
7 USB 3.1 Gen 1 (5Gbps) connectors (3 DCIs)	8 VGA connector
9 XClarity Controller network connector	10 Ethernet connectors of the OCP module on the rear (optional, two or four connectors may be available)

Server model with two 7mm hot-swap rear drive bays and one PCIe slot​

The following illustration shows the rear view of the server model with two 7mm hot-swap rear drive bays and one PCIe slots. Depending on the model, your server might look slightly different from the illustration below.

Table 7. Components on the rear of the server

1 PCIe slot 1 on riser 1 assembly	2 Rear 7mm drive bays (2)
3 Power supply 2 (optional)	4 Power supply 1
5 NMI button	6 VGA connector
7 USB 3.1 Gen 1 (5Gbps) connectors (3 DCIs)	8 XClarity Controller network connector
9 Ethernet connectors of the OCP module on the rear (optional, two or four connectors may be available)

Server model with two PCIe slots and a direct water cooling module​

The following illustration shows the rear view of the server model with two PCIe slots and a direct water cooling module. Depending on the model, your server might look slightly different from the illustration below.

Table 8. Components on the rear of the server

1 PCIe slot 1 on riser 1 assembly	2 Hose holder
3 Inlet hose	4 Outlet hose
5 PCIe slot 3 on riser 2 assembly	6 Power supply 2 (optional)
7 Power supply 1	8 NMI button
9 USB 3.1 Gen 1 (5Gbps) connectors (3 DCIs)	10 VGA connector
11 XClarity Controller network connector	12 Ethernet connectors on OCP module (optional, two or four connectors may be available)

Rear components overview​

Ethernet connectors​

Figure 5. OCP module (two connectors, seen from the rear)

Figure 6. OCP module (four connectors, seen from the rear)

The OCP module provides two or four extra Ethernet connectors for network connections.

By default, any of the connectors on the OCP module can function as a shared management connector.

Hot-swap drives and drive bays​

The drive bays on the front and rear of your server are designed for hot-swap drives. The number of the installed drives in your server varies by model. When you install drives, follow the order of the drive bay numbers.

The EMI integrity and cooling of the server are protected by having all drive bays occupied. Vacant drive bays must be occupied by drive fillers.

NMI button​

Press this button to force a nonmaskable interrupt (NMI) to the processor. By this way, you can make the operating system halt (such as Windows Blue Screen of Death) and take a memory dump. You might have to use a pen or the end of a straightened paper clip to press the button.

PCIe slots​

The PCIe slots are on the rear of the server and your server supports up to three PCIe slots on riser 1 and 2 assemblies.

Power supply units​

The hot-swap redundant power supply helps you avoid significant interruption to the operation of the system when a power supply fails. You can purchase a power supply option from Lenovo and install the power supply to provide power redundancy without turning off the server.

On each power supply, there are three status LEDs near the power cord connector. For information about the LEDs, see Power supply LEDs.

USB 3.1 Gen 1 (5Gbps) connectors​

The USB 3.1 Gen 1 (5Gbps) connectors are direct connect interfaces (DCIs) for debugging, which can be used to attach a USB-compatible device, such as a USB keyboard, USB mouse, or USB storage device.

VGA connector​

The VGA connectors on the front and rear of the server can be used to attach a high-performance monitor, a direct-drive monitor, or other devices that use a VGA connector.

XClarity Controller network connector​

The XClarity Controller network connector can be used to attach an Ethernet cable to manage the baseboard management controller (BMC).

Inlet and outlet hoses​

The Direct Water Cooling Module (DWCM) spreads two hoses out to connect to the manifolds. The inlet hose conveys warm water from the facility to the cold plates to cool down the processors, and the outlet hose conducts hot water out of the DWCM to realize system cooling.