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Overdrive is a passive utility program which reduces the cooldowns of other programs by 2 turns down to a minimum of 1 turn, but increases their PWR costs by 1. It has no effect on passive programs, programs with no cooldown, or programs with a cooldown of 1 turn. Overdrive can be bought from some Server Terminals for 700 credits.
Overdrive's effect always applies while it is installed, and cannot be enabled or disabled at will. Overdrive only reduces other programs' cooldowns at the time they are used, so if Overdrive is installed while another program is already on cooldown, it does not reduce that program's cooldown timer. If Overdrive is sold while another program is on cooldown, it also does not increase that program's cooldown timer.
Overdrive is not a common buy, and for good reason - not only does it take up a program slot and 700 credits for something that has no intrinsic benefit, it is actively harmful to any program that does not have a cooldown, making it cost 1 more PWR which includes most breakers.
However, it does have synergy with most programs that have cooldowns:
It doesn't really work with Flare since raising the firewalls each turn has obvious issues. It will also completely shut down Fusion, as it now costs 6 PWR to be on cooldown for 2 turns, only generating the 6 PWR it cost to run it.
Overall, it's difficult to get this to work with a loadout because of the programs it needs to be paired with. The synergy with Burst is quite notable, potentially allowing enough PWR generation to pay for the increased costs, but the breakers it wants to be paired with are usually not as strong early in a campaign because most devices have less than 3 firewalls. In endless, Modulate 2.0 looms over strategies that rely on the synergy with Burst.