It is shocking that this article is coming from Intel!
The lights. They're easy to install. They plug into the extra power connectors from the power supply. You can daisy chain the lights, but I quickly discovered that you don't want to go more than two lights per outlet. If you connect more than two lights to a power supply cables, the lights don't get as much power and are dimmer. That's where the monster power supply comes in handy. More power, more lights.
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guide to make sure you know how to mod your rig!