A support assembly includes a first slide rail assembly, a second slide rail assembly, a first cable management device and a second cable management device. The first slide rail assembly includes a first rail and a second rail movable relative to the first rail. The second slide rail assembly includes a third rail and a fourth rail movable relative to the third rail. The first cable management device is mounted to the second rail of the first slide rail assembly and the fourth rail of the second slide rail assembly. The second cable management device includes a first cable management arm and a second cable management arm. The first cable management arm is mounted to the first rail of the first slide rail assembly and the second cable management arm is mounted to the second rail of the first slide rail assembly.