> For the complete documentation index, see [llms.txt](https://wiki.wisdpi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.wisdpi.com/computer/wisdpi-prom21-all-in-expansion-card.md).

# WisdPi PROM21 All in Expansion Card

The PROM21 All in is a flagship PCIe x4 expansion card powered directly by the AMD B650 (Promontory 21) desktop chipset. It delivers desktop-grade I/O bandwidth, massive storage capacity, and next-gen connectivity to any workstation or high-performance PC.

Standard usage

<figure><img src="/files/YjOitbv6KORSfMSd2FDj" alt=""><figcaption></figcaption></figure>

## Features

* Desktop Chipset Power: Built around the AMD B650 chipset for rock-solid stability and massive data throughput over a single PCIe x4 slot.
* Switchable Oculink Port: Features a versatile Oculink interface that multiplexes PCIe and SATA signals. Easily switch between configurations via the onboard DIP switch (SW1) to support external GPUs or enterprise storage arrays.
* Quad M.2 Storage Matrix: Equipped with 4x M.2 slots (2 on the front, 2 on the rear). Maximize your storage capacity with support for high-speed NVMe and SATA SSDs using the chipset's dedicated downstream lanes.
* High-Speed USB Hub: Rear I/O includes a blisteringly fast 20Gbps USB-C port alongside four 10Gbps USB-A ports for zero-bottleneck peripheral connections.
* Robust Power & Cooling: Features a dedicated external power connector (EXT\_PWR) to ensure stable voltage under heavy loads, paired with a custom aluminum heatsink and a dedicated cooling fan header.

## Spec

| **Feature**       | **Specification**                                                                |
| ----------------- | -------------------------------------------------------------------------------- |
| Controller        | AMD Promontory 21 (B650 Chipset)                                                 |
| Host Interface    | PCIe 4.0 x4                                                                      |
| Storage Expansion | 4x M.2 Slots                                                                     |
| Next-Gen I/O      | 1x Oculink Port (Multiplexed PCIe/SATA)                                          |
| External USB      | <p>1x USB 3.2 Gen 2x2 Type-C (20Gbps)</p><p>4x USB 3.2 Gen 2 Type-A (10Gbps)</p> |
| Internal USB      | 6x USB 2.0 front panel header                                                    |
| Power Delivery    | PCIe Slot Power + ext power connector                                            |
| Cooling           | Aluminum Heatsink with onboard Fan Header                                        |
| Compatibility     | x86(AMD/Intel) / ARM(Mac Silicon Series/Raspberry Pi 5) standard PCIe            |
| Size              | 175x70mm                                                                         |

## I/O Functions

<figure><img src="/files/LsDc2hS4XntOzQoFmjcT" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/00yCVFDHP1Zs4uv3uR2o" alt=""><figcaption></figcaption></figure>

<table><thead><tr><th width="69">No</th><th width="195.0001220703125">Silk</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>EXT_PWR for USB</td><td>12V PCIe 6-Pin Power Connector. <strong>To use the USB port, this power supply must be connected.</strong></td></tr><tr><td>2</td><td>20G USBC1</td><td>USB 3.2 Gen2 x2 20Gbps port x1</td></tr><tr><td>3</td><td>10G USBA1~4</td><td>USB 3.2 Gen2 10Gbps port x4</td></tr><tr><td>4</td><td>HS USBA5~10</td><td>Front Panel USB 2.0 Header 480Mbps port x6</td></tr><tr><td>5</td><td>PCIe/SATA Oculink</td><td>Oculink (SFF-8611) port config by SW1</td></tr><tr><td>6</td><td>M.2_3</td><td>M.2 M-Key 2280/22110 PCIe 4.0 x4*</td></tr><tr><td>7</td><td>M.2_1</td><td>M.2 M-Key 2280/22110 PCIe 4.0 x4*</td></tr><tr><td>8</td><td>FAN</td><td>12V FAN power connector</td></tr><tr><td>9</td><td>SATA LED1~4</td><td>Data status of SATA 1~4 port</td></tr><tr><td>10</td><td>M.2 LED1~4</td><td>Data status of M.2 1~4 port</td></tr><tr><td>11</td><td>SW1</td><td>Oculink port configuration switch</td></tr><tr><td>12</td><td>M.2_4</td><td>M.2 M-Key PCIe 4.0 x2</td></tr><tr><td>13</td><td>M.2_2</td><td>M.2 M-Key PCIe 4.0 x2</td></tr></tbody></table>

> **\*Note: If M.2\_2 and/or M.2\_4 are in use, M.2\_1 and M.2\_3 will automatically drop to x2 lanes mode.**

## Oculink (SFF-8611) port configuration (SW1)

<figure><img src="/files/39vvvseX0tNmDNb91tMT" alt=""><figcaption></figcaption></figure>

## M.2 slot lane distribution

* M.2\_1 & M.2\_3: Support PCIe x4 lanes (standalone mode).
* M.2\_2 & M.2\_4: Support PCIe x2 lanes.

> **Note: If M.2\_2 and/or M.2\_4 are in use, M.2\_1 and M.2\_3 will automatically drop to x2 lanes mode.**

<table><thead><tr><th>M.2_1</th><th width="187">M.2_2</th><th>M.2_3</th><th>M.2_4</th></tr></thead><tbody><tr><td>4.0 x4</td><td>/</td><td>4.0 x4</td><td>/</td></tr><tr><td>4.0 x2 </td><td>4.0 x2 </td><td>4.0 x2 </td><td>4.0 x2 </td></tr></tbody></table>