In Dead Space power nodes are items used to upgrade weapons, armor and abilities.

Power nodes are found in hidden stashes, on the bodies of corpses and as rewards for defeating tough enemies or getting through difficult areas. The player can then use the power nodes at workbenches, where they will be presented with a circuit diagram with a limited amount of slots in which to place nodes and upgrade abilities, forcing them to choose what they want to specialize in.Eurogamer: Dead Space Review Power nodes can upgrade armor for toughness and oxygen capacity, damage and reload time for weapons, and more. The stores scattered throughout Dead Space also have power nodes available for high prices.ve3tro: Dead Space Review