Sorry for this - I'm about to give you more information, but will try not to add confusion!
There are two different types of devices for connecting several fans to mobo motor headers, but they can appear similar. Worse, the sellers of these use the two labels as if they mean the same thing, and that is wrong. A SPLITTER is a simple device. When it looks like a collection of cable "arms" it has one arm ending in a female connector (with holes) that plugs into a mobo fan header. Then it has two or more output arms (male connectors with pins) where you can plug in fan motor cables. The Splitter merely connects all the fans' wires in parallel to the outputs of the mobo header so they all get the same signals. This means that ALL of the fans involved must share the power available from the host header, and most headers have a limit. They all supply power at 12 VDC up to a max current load of 1.0 A. When using a Splitter you must find the max current spec for each fan (from its label or from its internet web page) and add up all those for the group of fans on this Splitter / header, and that total cannot exceed 1.0 A. (SOME mobo fan headers specify (in their mobo manuals) that they have a higher current limit.) A Splitter may look like a collection of cable "arms", or like a small circuit board, or like a closed box with output connectors recessed inside holes, but they all work the same.
A HUB is different in one clear factor that is easy to find when you know what to look for. It has an extra THIRD type of input that must be connected directly to a 4-pin Molex or a SATA power output connector from the PSU. This device still connects all fans to some of the host header's pins, but changes the POWER source for the fans. ALL the fans get their 12 VDC power direct from the PSU and draw none from the host header. So the current limit of the header does NOT apply. (A Hub still has a max curent limit, but it is much higher so you are VERY unlikely to exceed that with any reasonable number of fans.) HOWEVER, a HUB is designed so that it can only share out to its fans the PWM signal for its header to all its fans. That signal is how the SPEED of a fan is controled IF it is a new 4-pin PWM-style fan. But for an older 3-pin fan this signal can NOT be used and speed is controlled differently, so you cannot control the speed of a 3-pin fan using a HUB. So for 3-pin fans you can use only a SPLITTER.
Any mobo fan header receives from its fan a speed signal (a series of pulses) that it counts to display speed, although it does NOT use this information to actually control speed. It DOES monitor that signal for NO signal, though. That indicates fan FAILURE and prompts a warning message on your screem, and often even more actions for the CPU_FAN header to protect the CPU from overheating. However, that header can deal the speed signal of pulses from only ONE fan, so any Splitter or Hub will send to its host header the speed signal from only one of its fans, and will ignore all the others. The speeds of those "others" will never be seen (or monitored) anywhere. For a Splitter or Hub that looks like a collection of cable "arms", this is easy to see. The speed signal is sent along Pin #3 of each connector. So among the output arms, only one of them will contain all 4 pins, and the others will be missing Pin #3 so that those fan's signals cannot be sent anywhere. On a unit that looks like a circuit board or a box with recessed outputs, ONE of those will be marked as the only one that can send a speed back to the host header. In all cases you must ensure that the one output that can send back the speed signal HAS a fan plugged in there.
Before proceeding let me alert you to a confusing thing. We use the labels "3-pin" and "4-pin" a lot, BOTH for fan MOTOR connections and for fan LIGHTING connections. That is becasue that really is how the connectors appear. But these are DIFFERENT connectors on the ends of SEPARATE cables from a lighted fan. In fact, the lighted fan really is two seperate devices in one unit - a fan MOTOR, and LIGHTS - each with their own power and control needs. The two are NOT related, so a "4-pin fan" motor may have NO lights in its frame, or "4-pin" lights (the plain RGB type). or "3-pin" lights (the newer ARGB type.)
For LIGHTING connections, the cables on the fan are separate, the connectors on the ends are wider than for a fan motor and they go to different mobo headers. But very similarly to the discussion above for fan motors, you can get Splitters or Hubs for the LIGHTS in the fan frames. The difference between a Splitter and a Hub for lights is the same - the HUB has that third extra connection direct to a PSU power source so that its lights get all power from the PSU and NOT from the mobo header. Because older plain RGB (4-pin) and newer Addressable RGB (ARGB, 3-pin) require differnet connections, UNlike the way fan MOTOR connectors are designed, lighting Splitters and Hubs must be different for the two lighting types. Typical mobo lighting headers CAN supply power and control to several lighting units (say, 3 or 4 lighted fans) from EACH such header - usually the mobo manual will tell you of the lmits. So you need a lighting HUB only if you have a lot of lighted fans to connect to only one header. Because your mobo has THREE ARGB headers to work with, you will NOT need a HUB, OP. You can simply connect all the AIO system lights to one header using the "daisy chain" feature they include (you are RIGHT, this is just like using a Splitter), then use one ARGB Spltter to connect the case vent fans' lights to another, and plug the cable from the case's built-in strip light control system into the third header.
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