Probably not. That just means the maximum current it will pull. Beyond that, it really tells us nothing else because it is the design of the actual motor that then affects how fast it will spin (RPM), and it is the relationship of the RPM plus the blade design (pitch, width, surface area, and length) that then determines the amount of air (CFM) the blades will push (or pull).
Sadly, you told us absolutely nothing about your computer or this PSU so we have no clue the demands your computer may be putting on this PSU, nor do we know the specs/capacity of this PSU to know if it is working near capacity most of the time (thus needing more cooling) or if it is just loafing along most of the time not even breaking a sweat.
Note most (if not all) of the better PSUs have fan speed controllers that adjust the fan speed based on the load encountered or temperature in the PSU. Many will not even spin up the fan until some load/temperature is threshold is crossed to help keep noise levels down. But again, because we don't know what PSU you have, we don't know if yours has a fan speed controller, or if it just runs full speed all the time.
You need to determine the maximum power demands of your computer (motherboard, CPU, GPU, RAM, drives), then determine how much headroom your PSU has. If your computer requires 275W and you only have a 300W supply, that fan may not be able to move enough air to keep the PSU properly cooled. If you have a 600W supply and a 275W load, I doubt the PSU is working hard enough to require more air flow.