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Thank you for your interest in the Joule platform.
Yes, there’s a PCIe slot in the Joule, however, the current BIOS doesn’t enable the connector so it would be necessary a new BIOS which is currently not available and there’s no ETA for it yet. If I’m not mistaken some months ago another user used a custom carrier board along with the Joule and apparently was able to edit the BIOS to enable the PCIe connector. You can check it here https://communities.intel.com/thread/108364.