> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# SelectModelDevice - ComfyUI Built-in Node Documentation

> Complete documentation for the SelectModelDevice node in ComfyUI. Learn its inputs, outputs, parameters and usage.

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/SelectModelDevice/en.md)

## Overview

The SelectModelDevice node allows you to manually choose which device (CPU or a specific GPU) a diffusion model runs on. It can move a model to a different device, and it handles conflicts with other multi-GPU nodes automatically.

## Inputs

| Parameter | Data Type | Required | Range                                                                                                                                            | Description                                                                                                      |
| --------- | --------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------- |
| `model`   | MODEL     | Yes      |                                                                                                                                                  | The diffusion model to place on a specific device.                                                               |
| `device`  | COMBO     | Yes      | `"default"`<br />`"cpu"`<br />`"gpu:0"`<br />`"gpu:1"`<br />`"gpu:2"`<br />`"gpu:3"`<br />`"gpu:4"`<br />`"gpu:5"`<br />`"gpu:6"`<br />`"gpu:7"` | The target device for the model. Options are dynamically generated based on available GPUs. (default: "default") |

**Parameter Details:**

* `"default"`: Restores the device assigned by the model loader, even if a previous SelectModelDevice node changed it.
* `"cpu"`: Pins both the load and offload device to the CPU.
* `"gpu:N"`: Pins the load device to the Nth available GPU (e.g., `"gpu:0"` for the first GPU). The offload device is restored to the loader's original choice.

**Important Notes:**

* If the requested device does not exist on the current machine (e.g., a workflow created on a 2-GPU machine is opened on a 1-GPU machine), the node will pass the model through unchanged and log a message instead of failing.
* If the model is already on the requested device, the node takes a fast path and does not reload the model.
* Placing this node *after* a node that has already consumed the model (e.g., a KSampler) is not recommended, as any state changed by the prior node will be observed if the device matches the original.

## Outputs

| Output Name | Data Type | Description                                                                                                                              |
| ----------- | --------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| `model`     | MODEL     | The diffusion model, now placed on the selected device. If the device was invalid or unavailable, the model is passed through unchanged. |

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