That depends on a fan hub used. But regardless the fan hub used, all fans connected to it will run in sync (same speed). If you want individual control over each fan, then you'll need a fan controller.
Few examples of fan hubs:
Silverstone fan hub, specs:
https://www.silverstonetek.com/product.php?area=en&pid=526
Can control 4-pin fans without issues via PWM mode but 3-pin fans plugged to it will run 100% all the time. Supports up to 8x fans.
Thermaltake Commander FX, specs:
https://www.thermaltake.com/Cooling/Cooling_Accessory_/Fan_Controller/C_00002391/Commander_FX_10_Port_Fan_Hub/design.htm
Can control only 3-pin fans via DC mode, where all fans run in sync. It doesn't support 4-pin fans. Supports up to 10x fans.
Phanteks fan hub, specs:
http://www.phanteks.com/PH-PWHUB.html
Is unique since it can control both, 3-pin and 4-pin fans via PWM mode. Supports up to 6x fans.
Fan controllers come in 2 designs: internal and external.
Internal ones are similar to fan hubs, but bigger and cost a lot more money, e.g Corsair Commander Pro, NZXT Grid+ V3. External fan controllers sit in the 5.25" external bay, e.g Thermaltake Commander F6 RGB, NZXT Sentry 3, Aerocool X-Vision. (I have all listed 3x external fan controllers in use between 3x of my builds, full specs with pics in my sig.)
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