The Dell Dimension 8100 (circa 2001) uses two proprietary DC power connectors — a 24-pin P1 and a 16-pin P2 — that are physically distinct from the standard Intel ATX power connectors and are not interchangeable with them. Compatible power supply units are the Dell NPS-330CB B/E and PS-5251-1D; fitting a standard ATX PSU risks immediate damage to both the supply and the motherboard. The Dimension 8100 was the last Dell desktop to employ a fully non-standard power connector arrangement before Dell transitioned to standard ATX pinouts with its Pentium 4 systems.
P1
24 pin DC power connector.
24 pin MOLEX 39-01-2240 or equivalent connector at the PSU cable.
| Pin | Function | Color | Pin | Function | Color |
|---|---|---|---|---|---|
| 1 | +5 VDC | red | 13 | PSON#2 | grey |
| 2 | Common | black | 14 | Common | black |
| 3 | +5 VDC | red | 15 | Common | black |
| 4 | Common | black | 16 | Common | black |
| 5 | PWRGOOD | orange | 17 | N/C | |
| 6 | +5 VFP | purple | 18 | +5 VDC | red |
| 7 | +12 VDC | yellow | 19 | +5 VDC | red |
| 8 | –12 VDC | blue | 20 | +5 VDC | red |
| 9 | Common | black | 21 | TFSC | brown |
| 10 | Common | black | 22 | +5 VDC | red |
| 11 | +3.3 VDC | blue/white | 23 | +3.3 VDC | blue/white |
| 12 | +3.3 VDC | blue/white | 24 | Common | black |
Notes
- Pin 5 — PWRGOOD is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation.
- Pin 13 — PSON# is the power-on control signal. It is activated by pressing and releasing the power button whilst the power supply is in standby mode; pulling PSON# to ground switches the supply to full-on condition, consistent with the active-LOW logic of the Intel ATX PS_ON# signal.
- Pin 21 (TFSC) — thermal fan-speed control; may be unused (N/C) on some units.
- The 24-pin P1 housing is a Molex 39-01-2240. Despite using the same Mini-Fit Jr shell family as standard ATX 24-pin connectors, the signal assignments differ; a standard ATX PSU must not be substituted.
- Dell Precision 610 and related workstations of the same era use a physically similar 24-pin P1 connector, but the signal assignments for pins 17–24 differ from those of the Dimension 8100.
- Compatible replacement PSUs: Dell NPS-330CB B/E and PS-5251-1D.
P2
16 pin DC power connector.
16 pin Dell dimension PSU connector at the PSU cable.
| Pin | Function | Color | Pin | Function | Color |
|---|---|---|---|---|---|
| 1 | +3.3 VDC | blue/white | 9 | +5 V | red |
| 2 | Common | black | 10 | Common | black |
| 3 | +12 V | yellow | 11 | N/C | |
| 4 | N/C | 12 | N/C | ||
| 5 | N/C | 13 | N/C | ||
| 6 | N/C | 14 | +5 V | red | |
| 7 | +12 V | yellow | 15 | Common | black |
| 8 | Common | black | 16 | N/C |
References
- Compaq Computer Corporation — Compaq Deskpro EN 6550/6400 Service & Reference Manual, document 133756-004 (Connector Pin Assignments, Appendix A, pages 46–47) — documents the proprietary OEM power connector family (14-pin, 20-pin, and 24-pin Compaq variants) that share the Molex Mini-Fit Jr housing also used by the Dell Dimension 8100 P1 connector; confirms that these connectors deviate from the Intel ATX Power Supply Design Guide. Available at https://www.manualslib.com/manual/370674/Compaq-133756-004-Deskpro-En-6550-Model-6400.html?page=46