Lenovo ThinkServer RD550 - Manual (Page 54)

15 USB 3.0 connectors (2)
Used to attach a USB-compatible device, such as a USB keyboard, mouse, scanner, or printer. If you
have more than six USB devices, you can purchase a USB hub, which you can use to connect additional
USB devices.
16 ThinkServer Trusted Platform Module connector
Used to connect a ThinkServer Trusted Platform Module (hereinafter referred to as the TPM), which is
a security chip, to enhance server security. See “Installing or removing the ThinkServer Trusted Platform
Module” on page 75.
18 SD module connector
Used to connect an SD module.
19 Serial connector
Used to attach a device that uses a 9-pin serial connector.
21 ThinkServer System Manager Premium connector
Used to connect a ThinkServer System Manager Premium to enable advanced remote management
functions on your server.
22 Redundant power supply connector 2
24 Redundant power supply connector 1
Used to connect a redundant power supply.
25 RAID upgrade key connector
Used to connect a ThinkServer RAID 110i upgrade key.
26 Intrusion switch connector
Used to connect to an intrusion switch.
28 32 35 40 Memory slots
There are 24 memory slots on the system board. For more information, see “Memory module installation
rules” on page 68.
23 Microprocessor 2 socket
37 Microprocessor 1 socket
For server models with two microprocessors, each of the microprocessor is secured in the microprocessor
socket on the system board and a heat sink is installed above it to provide cooling. For server models with
one microprocessor, the socket for the microprocessor 2 is protected by a microprocessor socket cover.
27 29 30 31 34 36 38 39 System fan connectors
Used to connect the cable of the corresponding system fan.
40 ThinkServer RD550 User Guide and Hardware Maintenance Manual