SP120 High Performance low RPM problem

Hi,



I got two SP120 High Performance fans that I use for my H100i.

The problem is that, one of them is running slower than the other.

I manually maxed out the speeds in bios settings.

Its like around 600 RPM slower than the other.

I tried connecting it to different fan headers in the motherboard.

But the one is always slower than the other.



Do I need to get it replaced?



Please let me know.

Thanks.