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

# Technical Specifications

> Hardware specifications, networking details, and pre-installed software for Thunder Compute instances

## Instance Infrastructure

### Hardware Specifications

* **GPU and CPU configs**: Check [pricing page](https://www.thundercompute.com/pricing) for latest availability
* **Location**: North America

### Pre-installed Software

* **CUDA**: Version 13.0
* **CUDA Driver**: Version 580
* **PyTorch**: Version 2.9.0+cu128
* **JupyterLab**: Pre-installed
* Additional scientific Python libraries (NumPy, Pandas, etc.)

<Warning>
  Do not attempt to reinstall CUDA. If compatibility issues arise, use a venv and change the versions of your other dependencies (e.g., PyTorch) rather than modifying the CUDA libraries.
</Warning>

## Storage

* **Persistent Disk**: Your home directory and OS. Preserved across modifications and included in snapshots. Can be expanded but not shrunk.
* **Ephemeral Storage**: Optional fast local NVMe disk mounted at `/ephemeral`. Not included in snapshots and lost when the instance is modified or deleted. Ideal for model weights, caches, and scratch files. See [Ephemeral Storage](/guides/ephemeral-storage).

| Storage Type      | Development Range | Production Range |
| ----------------- | ----------------- | ---------------- |
| Persistent Disk   | 100 - 400 GB      | 100 - 1000 GB    |
| Ephemeral Storage | 0 - 300 GB        | 0 - 500 GB       |

## Networking

* **Egress/Ingress**: 7 Gbps
* **IP Address**: Dynamic

### Port Access

* **Public URLs (CLI)**: Use `tnr ports forward` to expose HTTP services at `https://<uuid>-<port>.thundercompute.net` with automatic HTTPS and DDoS protection. See [Port Forwarding](/cli/operations/port-forwarding) for details.
* **Local tunneling (CLI)**: Use `tnr connect <instance_id> -t <port>` to tunnel ports to your local machine
* **VS Code**: Use the built-in [port forwarding](https://code.visualstudio.com/docs/debugtest/port-forwarding) feature