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

# SelectModelDevice - ComfyUI Built-in Node Documentation

> The Select Model Device node allows you to manually choose which device (CPU or a specific GPU) a diffusion model runs on.

The Select Model Device 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. Selecting `"default"` restores the original device chosen by the model loader.

## Inputs

| Parameter | Description                                                                                                                                      | Data Type | Required | Range                                                                                                  |
| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------ | --------- | -------- | ------------------------------------------------------------------------------------------------------ |
| `model`   | The diffusion model to place on a specific device.                                                                                               | MODEL     | Yes      |                                                                                                        |
| `device`  | The target device for the model. Options are dynamically generated based on the available devices on the current machine. (default: `"default"`) | COMBO     | Yes      | `"default"`<br />`"cpu"`<br />`"gpu:0"`<br />`"gpu:1"`<br />... (one `"gpu:N"` entry per detected GPU) |

**Parameter Details:**

* `"default"`: Restores the load and offload devices assigned by the model loader, even after a previous Select Model Device call.
* `"cpu"`: Pins both the load and offload device to CPU.
* `"gpu:N"`: Pins the load device to the Nth available GPU (for example, `"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 (for example, a workflow created on a 2-GPU machine is opened on a 1-GPU machine), the node passes the model through unchanged and logs a message instead of failing. Unknown `gpu:N` values are allowed during input validation so portable workflows do not error early.
* If the model is already on the requested device, the node uses a fast path and does not reload the model.
* When the requested device differs from the device the input model is already on, a fresh model is spawned using the loader's reload factory so the new patcher owns independent weights on the new device.
* If the model loader does not support multi-GPU (no reload factory), the node passes the model through unchanged and logs a warning.
* When a MultiGPU CFG Split clone already occupies the selected device, that clone is pruned so two models are not bound to the same device.
* When a non-default device is selected (CPU or GPU), the node also adjusts the model's compute dtype to one supported by that device.
* Placing this node after a node that has already consumed the model (for example, a KSampler) is not recommended, because any state changed by the prior node will be observed if the device matches the original.

## Outputs

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

> 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)

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