![](http://pdfasset.owneriq.net/8/03/803650e2-9bc1-438e-a7ca-4ea1a17069dd/803650e2-9bc1-438e-a7ca-4ea1a17069dd-bg26.png)
Figure 13. Inside the System—Redundant Power Supply Unit Chassis
1. cooling shroud
2. expansion-card latch
3. power supply (redundant)
4. expansion-card riser 2
5. expansion card
6. expansion-card latch
7. expansion-card riser 1
8. heat sink for processor 1
9. DIMMs (12)
10. cooling fans (6)
11. optical drive (optional)
12. hard drives (8)
13. information tag
14. control-panel board
15. hard-drive backplane
16. power-distribution board
17. power-interposer board
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