There are two manuals available for that mobo. The first is basic info here
https://dlcdnets.asus.com/pub/ASUS/...WIFI/E19402_PRIME_Z690-P_WIFI_V2_UM_PRINT.pdf
On it, see p. 1-2 for the mobo layout. The label ALL of the fan headers with item code 4. At top centre there are CPU_FAN and CPU_OPT. These are identical headers to be used for the CPU cooler system. Since you have a unit that includes a Splitter, you use that to connect BOTH of those fans to the CPU_FAN header, and do not use the CPU_OPT one.
At the middle of the mobo is the AIO_PUMP header. This is used ONLY for a pump in a CPU liquid cooler system you do NOT have, so do not use this header.
The mobo has three CHA_FAN headers for case ventilation fans. One is at the front edge about 1/3 down from the top. The other two are beside each other at bottom centre. If I understand correctly you will have FOUR case fans in addition to the two on the CPU cooler. So you need to connect those four to three headers. That is easy using ONE Splitter. You can buy either 3-pin or 4-pin fans, and I suggest you buy the 4-pin models but that is not really important. Your mobo can be adjusted to work with either type. The only important point here is that you can NOT mix a 3-pin fan with a 4-pin fan on the SAME mobo header and Splitter.
Background: the differences between Splitter, Hub, and Controller for fans. A Controller supplies power to a fan (or group of them) AND controls its speed. ALL of your mobo CHA_FAN headers are the Controllers - you do NOT need to buy any Controller. A SPLITTER is a simple device that connects two or more fans together in parallel to the output of one fan header. All its fans receive exactly the same signals, and all of the power for the fans comes from that header. The only limit here is that the header can supply 12 VDC power at up to 1.0 A maximum current load. Almost all common computer case fans today can use 0.10 to 0.25 A max current, so you can easily and safely connect at least three fans to any header using a Splitter. Some Splitters look like a group of cable arms like this
https://www.amazon.com/Cable-Matters-2-Pack-Way-Splitter/dp/B07PXLHNZ6/ref=sr_1_3?crid=DMFZINAQ43RK&keywords=fan+splitter&qid=1643483117&sprefix=fan+splitter,aps,87&sr=8-3
That is a 2-pack of Splitters with THREE output arms. When using it you do NOT need to connect fans to ALL its arms. But you DO need to plug one fan into the only output that has a flag marker on it and all four pins in it. Another type looks more like a small circuit board with headers on it, like this
https://www.amazon.com/ThreeBulls-Cooling-Splitter-Adapter-Computer/dp/B07M5P7VHG/ref=sr_1_5?crid=DMFZINAQ43RK&keywords=fan+splitter&qid=1643483355&sprefix=fan+splitter,aps,87&sr=8-5
Some Splitters look like a box with headers recessed inside holes in the box.
Note that these all have 4-pin connectors but you CAN use them with 3-pin fans.
A HUB is a different device that can look a lot like a Splitter (as above). But is has on EXTRA "arm" that MUST plug into a power output from the PSU. Here's and example that also looks like a collection of cable arms. Note the wide connector for a SATA power output from the PSU, and one input cable with a female connector that goes to a mobo fan header.
https://www.amazon.com/XMSJSIY-Adapter-Splitter-Desktop-Computer/dp/B093ST9W5L/ref=sr_1_84?crid=3IAUGAYX56K5Z&keywords=fan+hub&qid=1643483974&sprefix=fan+hub,aps,157&sr=8-84
It gets all its power for fans from that extra PSU connection and draws no power from the host fan header, so it avoids the 1.0 A current limit. However, such devices generally can be used only for 4-pin fans. Moreover, you only need them if you must connect MANY fans to one header.
So, OP, do NOT get a HUB, Get a Splitter similar to the ones I showed above. Use ONE of those to connect two of your four fans to one CHA_FAN header, and the others can go to their own headers.
Now, look at the manual for details of BIOS Setup adjustments, here
https://dlcdnets.asus.com/pub/ASUS/...UF_GAMING_Intel_600_Series_BIOS_EM_WEB_EN.pdf
Vedi pag. 5 per come accedere alla configurazione del BIOS all'avvio. A pag. 6 dice di usare il tasto F7 per raggiungere la Modalità Avanzata (pag. 7). Lì fai clic su Monitor in alto - vedi p. 67 e lì scegli la configurazione della ventola Q. Qui puoi scegliere ogni singola intestazione della ventola su cui lavorare. Guarda prima l'intestazione CPU_FAN. Nella parte inferiore puoi scegliere il PROFILO - come decide a quale velocità far funzionare la ventola - e assicurarti che sia impostato su "Standard". Per il MODE impostato su PWM per le ventole a 4 pin del dispositivo di raffreddamento della CPU. Esci con il tasto Esc e vai alla prima intestazione CHA-FAN che stai utilizzando. Per MODE, impostarlo su PWM se la ventola collegata è a 4 pin o su CC della ventola è a 3 pin. Per PROFILO impostalo su "Standard". Per Q-Fan Source, impostalo su "Scheda madre". Utilizzare Esc per tornare al menu QFAN e regolare tutte le altre intestazioni CHA-FAN esattamente allo stesso modo. Quando hai finito, torna indietro usando Esc per accedere al menu principale. Lì usa il tasto F10 per raggiungere il menu Esci (p. 86) e scegli Salva modifiche e ripristina. il sistema salverà le impostazioni e si riavvierà.
In questo modo tutti i tuoi fan saranno collegati alle intestazioni corrette e con le loro velocità controllate automaticamente dal mobo. Non è necessario un controller o un hub. Hai bisogno di un solo Splitter per aiutarti a farlo.
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Thank you so much😀
The last question because after this I think have solved. If the 2 fans connected to the splitter don't have fixed/preset speed, can they be adjusted only tougher or even individually? (then run the 2 fans at different speeds at the same splitter)