Some new systems for slots are server driven. The logic for the machine is in a central location as is the random number generator. Payout percentage can be changed at will by the casino as long as the machine is not being played. Pay-tables will show the new schedule on video poker machines so you can see how the machine you played earlier has been reset to a different set of odds. On slot machines, you won't be able to see any difference, but the payout frequency can be different than the last time you played. The server based systems have the approved electronics in a remote room so there's no longer a need to change a card in a machine to give it a different hold percentage but the casino has only Gaming approved schedules to select from.

Places like Cosmopolitan and Aria in Las Vegas opened with this kind of setup and other casinos are gradually converting to it.

Another nice feature for the player is the ability to accept a payout over the $1200 max limit and have it logged to your player number. The machine is then unlocked and you can then continue to play without waiting for an attendant to visit you and give you cash or a ticket. You get a sheet detailing all these pays when you quit play and only one W2G for the session you played. This is mainly of interest to high-limit players ($5 and up) where lockups are frequent; their rate of play is probably 10x as fast when no attendant intervention is needed.