Overclocker Upgrade: each time ×0.7, usage ×1.6.
Transformer Upgrade: +1 voltage tier (prevents explosions).
Energy Storage Upgrade: +10,000 EU buffer.
Ejector Upgrade /
Pulling Upgrade: push items into / pull items from adjacent chests. Sneak + right-click a block face with the upgrade to set the direction (e.g. only up into the next machine); without a direction it never feeds other IC2 machines.
Redstone Signal Inverter Upgrade: inverts the redstone signal — induction furnace, thermal centrifuge and blast furnace stay hot without a signal.
IndustrialCraft 2 · Machines
Upgrades
Overclocker Upgrade: each time ×0.7, usage ×1.6. Transformer Upgrade: +1 voltage tier (prevents explosions). Energy Storage Upgrade: +10,000 EU buffer. Ejector Upgrade / Pulling Upgrade: push items into / pull items …

You find the same texts in game with /handbuch.
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