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200mm Fan Dying...Or Not?

Sturmgewehr_44
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The 200mm fan in my Coolermaster CM Storm Enforcer occasionally emits these, not whiny, but highly irritating grinding noise. It does this particularly at higher rpms, around 800rpm, and I am not sure how long it has been doing this and what exactly it means. To me, it seems like the bearing (it is a stock case fan, thus sleeve bearing) is going, or it's lubricant is running out. However, I am unsure because the sound can come and go, and although not very loud, it is perceivable if listening closely without having my headset on.

 

I've noticed this "issue" for around two months. I am not sure if it always had it's "grinding" sound, because it can be very faint, and does fluctuate as it does not always appear. What exactly is happening?

Specs: Asus ROG Maximus VII Formula (Motherboard) | i7-4790k (CPU) | EVGA Geforce GTX 1080 Founders Edition (Graphics Card) | Samsung 850 EVO 250GB (C:) (SSD) | Western Digital Caviar Black 3TB (G:) (HDD) | Western Digital Caviar Black 1TB (F:) (HDD) | LG 14X BD Rewriter (D:) (Optical Drive) | Corsair H80i GT (CPU Cooler) | Corsair Vengeance 16GB (4x4) DDR3 1600MHz (RAM) | OCZ ZX 850W (Power Supply) | Coolermaster CM Storm Enforcer (Case) | Asus ROG Swift VG278Q 144Hz 1440p (Monitor) | Kingston HyperX Cloud (Headset) | Corsair Vengeance K70 (Keyboard) | Corsair Vengeance M60 (Mouse) | Noctua NF-F12 (x4) (Fans).
 

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