GS800 fan making a strange click sound when powering down.

Hello all, maybe somebody can share some thoughts or insight with me. Bought a GS 800 last week and promptly installed it correctly.

I have noticed a slight CLIck CLick Click click sound ONLY when shutting computer off or going in to sleep mode. I know it is the PSU ball barring fan making that noise.

Can anyone tell me if this is normal for this model or should I take it back to the store I bought it from and do an even exchange. :thinking: