OK, we're obviously not on the same page here.
Motherboards generally have either built in thermal sensors, or throttle fans to a given percentage of maximum speed constantly. The former option uses thermal readings, and an output curve to determine how fast fans spin. For example; 28C is 25% fans, 30C is 25%, 40C is 40%, 50C is 60%, 60C is 80%, 70C is 80%. This way, fan noise during non-intensive use can be minimized to decrease noise. The latter option throttles a fan speed to a percentage of maximum constantly, so there is a minimum of noise. The first option is more expensive, the second doesn't account for heating. They have their purposes.
The BIOS/UEFI is how a motherboard's fan controls are accessed. If there are thermal curves you can set them (higher percentages or a more graduated spin-up), and if there is a constant percentage you can set that. Asus offers a program to do this from inside windows, but it is the same as direct access.
So yes, you should be able to set the fans to run at 100% all of the time no matter how you control them. The only question is whether the motherboard socket will deliver sufficient power to more than a couple of fans, and that information is in the motherboard manual.