Dell YRC3G Owner's Manual page 60

9 Power control port
11 PCIE1
13 System fan port
15 FLEX0 thermal sensor
17 24 pin power cable
19 Power remote
21 System fan 0
23 Front panel USB3.2 port
25 SATA 0, 1, 2, 3, 4, 5 and ODD 0, 1 ports
60 Removing and installing components
10 PCIE0
12 CPU fan port
14 Coin cell battery
16 FLEX1 thermal sensor
18 Front panel port
20 USB 2_INT
22 USB 2_flex
24 Front panel USB3.1 port
26 VROC_key