When I got the replacement cooler from Amazon, the first thing I did was to plug the fan directly into the power supply. When you do that, the expected result is for the fan to spin up at full speed - that is at 2000RPM. I made sure that the RPM limiter switch was switched to the performance mode as well. To my relief, the fan seemed to run at full speed though there was no way to confirm that the fan was hitting 2000RPM. But it definitely felt like 2000RPM, for the sound and the air flow generated from it.
But I wouldn't be running the fan directly off the PSU. I would be running it off the motherboard CPU fan headers. It wouldn’t mean squat if it cannot work with the motherboard. So to find out if if the motherboard truly wasn’t the culprit the last time, I plugged in the fan to the motherboard and luckily for me, it also ran at full speed. w00t!
There was no way in hell that I would be running the fan at 2000RPM. While it is not as deafening as the two TY-143’s I had on the Silver Arrow Extreme cooler, I still had to tame down the fan speed.