This is the CPU Fan Pinout for the Proliant ML310 Generation 1, may be compatible to other Proliant Servers and ML310 Generations.
Uses non-standard 4-Pin-Fan-Connector Wiring, possibly to lock out cheap 3rd party fans.
The only special line is the "Status"-Line. For normal operation, it is tied to Pin 1 (GND). An Open Pin 2 means either "Fan not present" or "Fan Failure".
| Pin Number |
Pin Name |
Description (may be empty) |
| 1 | GND | |
| 2 | Status | Fan Present / Fan Failure |
| 3 | Sense | Standard Tachometry Signal |
| 4 | 12 V |
Bridge Pin 1 and 2 to be able to connect normal Fans. Please bear in mind that in this connector "Sense" comes before 12V, not the other way around as in normal Fan connectors, so if you force a 3-pin Fan on this connector after bridging 1&2 at the Mainboard, swap Sense and 12V first!