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| System Board and Riser Board Reference Designators | |
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| Designator | Component (Continued) | ||
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| P20 | Primary IDE connector | ||
| P21 | Secondary IDE (Multibay) connector | ||
| P22 | Slimline | ||
| P23 | Header for front audio panel | ||
| P24 | Header for front panel USB | ||
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| P25 - P26 | Video memory upgrade connector | ||
| P27 | MultiBay header | ||
| P29 | SCSI LED connector | ||
| P30 | Primary serial ATA port | ||
| P31 | Secondary serial ATA port | ||
| P52 | Serial port header | ||
| P53 | First serial port | ||
| P54 | Second serial port | ||
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| P55 | Double stack serial port | ||
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| Top | Serial B | |
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| Bottom | Serial A | |
| P58 | Riser edge connector | ||
| P70 | Primary chassis fan header (xw6000 Configuration 1) | ||
| P70 | Primary CPU fan header (xw6000 Configuration 2) | ||
| P70 | CPU fan header (xw4000) | ||
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| P71 | Secondary chassis fan header (xw6000 Configuration 1) |
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| P71 | Secondary CPU fan header (xw6000 Configuration 2) | ||
| P89 | Floating serial port /COM port header | ||
| P100 | ITP connector | ||
| P101 | Security card connector | ||
| P120 | Front chassis fan header (xw6000) | ||
| P124 | Hood lock header | ||
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| P125 | Hood sensor header | ||
| P216 | White box chassis fan | ||
| SW1 | Processor speed switch | ||
| SW2 | Security hood switch | ||
| SW50 | Clear CMOS switch | ||
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| SW51 | Power button switch | ||
| XBT1 | Battery socket | ||
| XMM1 | Memory slot. DIMM1 or RIMM1 populated and tested | ||
| XMM2 - XMM5 | Following memory slots | ||
| XU1 | Primary processor socket | ||
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| XU2 | Secondary processor socket |
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| XU15 | ROM socket | ||
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| Service Reference Guide |