Dell R300 owner manual redundant power supplies optional, SAS external controller daughter card

3	system board shroud	4	redundant power supplies (optional)
5	left riser	6	SAS external controller daughter card
7	SAS RAID external controller	8	center riser
	daughter card battery and
	memory module
9	SAS internal RAID controller	10	SAS card connector
	daughter card
11	RAC card	12	memory modules (6)
13	CPU/heatsink	14	dual fan module bays 1 and 2 (4 fans)
15	SAS/SATA backplane cable	16	SATA/SAS backplane cable
	connector
17	hot plug hard drive bays 0 and 1	18	one optional slimline drive
19	LCD control panel	20	chassis intrusion switch
21	control panel assembly	22	power supply
			dual fan modules (2 fans)
23	power distribution board	24	power distribution board cover

NOTE: In the preceding figure, the 12C cable is shown connecting over the control panel cabling. This cable should be routed under the control panel cable and the internal USB key connector. The 12C cable seats in a cable guide clip that is directly beneath the control panel connector.

The system board holds the system's control circuitry and other electronic components. The processor and memory are installed directly on the system board. Using a riser card, the system can accommodate two expansion cards. The peripheral bays provide space for up to two hard drives and an optional optical drive. Power is supplied to the system board and drives through one nonredundant power supply. The optical drive connects to the SATA controller on the system board. For more information, see "Optical Drive" on page 79.

The hard-drive bays provide space for up to two 3.5-inch SAS or two 3.5-inch SATA hard drives. The hard drives connect to a SAS controller card through the SAS/SATA backplane board. For more information, see "Hard Drives" on page 73, "Backplane Board" on page 100, and "Expansion Cards" on page 95.

During an installation or troubleshooting procedure, you may be required to change a jumper setting. For more information, see "System Board Jumpers" on page 155.

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Installing System Components