50 Cent Signs 8-Figure Deal with Starz to Extend Partnership to 2019

50 Cent's got a lot more money -- 8 figures worth -- to bring a lot more than just "Power" to the screen with Starz ... TMZ has learned.

Sources close to the deal tell us ... it includes 3 projects the rapper-turned actor/producer already has in development -- "Black Mafia Family," "Tomorrow, Today" and a third to be announced soon.

As you may know ... Fiddy currently boasts the hugely successful show "Power" on Starz, the most-watched series on the network. He also produces "50 Central" on BET and releases exclusive new music through his shows.