Thin fans on the motherboard can affect performance positively or negatively depending on the situation.
Thin fans on the motherboard can affect performance positively or negatively depending on the situation.
I found a suitable space on the side panel near the back of both your motherboard and CPU socket. You can buy and install thin 120mm fans there to improve cooling. It’s a $20 purchase, but whether it’s worth it depends on how much you need better performance.
If the rig was overheating severely, adding a fan behind the motherboard was only a temporary fix. It would have needed a stronger CPU cooler and improved case ventilation.
It's fine if you just put a piece of air into the case to bring in fresh, cool air from outside. This helps cool the back side of the motherboard, allowing you to manage its temperature.
It can't cause harm except because many of those (just like me) lack dust filtration, making it unsuitable for intake use. It might work as exhaust only draws more warm air into the space. I think it's probably just a marketing trick the case designer intended to be effective.
The discussion highlights a solution for overheating using small fans near the CPU socket and NB, though it doesn't address overclocking or rig setup.
If the rig was overheating severely, adding a fan behind the motherboard was only a temporary fix. It would have needed a stronger CPU cooler and improved case ventilation.