PCIe x1 is the smallest PCIe slot with one lane providing 500 MB/s (PCIe 2.0), 985 MB/s (PCIe 3.0), or 1969 MB/s (PCIe 4.0). Used for network cards, sound cards, USB controllers, and other low-bandwidth expansion.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | PRSNT1# | Presence detect | I/O |
| 2 | 12V | 12V supply | PWR |
| 3 | 12V | 12V supply | PWR |
| 4 | GND | Ground | GND |
| 7 | CLKREQ# | Clock request | I/O |
| 11 | PERST# | PCIe reset active low | I/O |
| 17 | PETTXP | TX lane 0 positive | BUS |
| 18 | PETTXN | TX lane 0 negative | BUS |
| 32 | PETRXP | RX lane 0 positive | BUS |
| 33 | PETRXN | RX lane 0 negative | BUS |
| 36 | PRSNT2# | Presence detect | I/O |
PCIe x1 is the smallest PCIe slot with one lane providing 500 MB/s (PCIe 2.0), 985 MB/s (PCIe 3.0), or 1969 MB/s (PCIe 4.0). Used for network cards, sound cards, USB controllers, and other low-bandwidth expansion.