Very important for all those configuring their Model X production model. The regular model X comes with a 48 amp on board charger. You can choose an option to get your Model X with a 72 amp charger instead for an extra $1000. This will allow you to charge at higher speed if you are using a high powered HPWC or J1772 station. The option is hidden as an Easter egg in the main configuration screen. See this post for more info: Poll: Would you pay for a higher power Model X charger? - Page 5 The higher power on board charger is not related to Supercharging, it only affects charging using an AC power source. Note that Signature Model Xs come with the 72 amp charger standard.