Dell Precision 450 - Manual (Page 51)

System Board Components
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I/O panel Yellow pull tab
1 CD/DVD drive connector (IDE2) 14 PCI card connectors (PCI1, PCI2 [32-bit connectors], and PCI3 [64-bit PCI-X
connector])
2 I/O panel (I/O PANEL) 15 telephony connector (MODEM)
3 floppy drive connector (DISKETTE) 16 AGP card connector (AGP)
4 memory module connectors (DIMM_1, DIMM_2, DIMM_3,
DIMM_4) 17 VRM connector (VRM) (for a second microprocessor only)
5 suspend-to-RAM light (STR_LED) 18 microprocessor and heat-sink connector (CPU_1)
6 power connector (POWER 2) 19 front-panel audio connector (FP2AUDIO)
7 power connector (POWER 1) 20 microprocessor and heat-sink connector (CPU_0)
8 USB connector (USB) 21 microprocessor fan connector (FAN_P1)
9 hard-drive connector (IDE1) 22 microprocessor fan connector (FAN_P0))
10 real-time clock reset jumper (RTCRST) 23 battery socket (BATTERY)
11 password jumper (PSWD) 24 internal speaker (SPKR)
12 auxiliary LED add-in storage adapter connector (AUX_LED) 25 CD drive audio cable connector (CD_IN)
13 standby power light (AUX_PWR_LED)