Yep, it will keep your CPU cool if you're not OC... but be prepared, it's really really noisy. Not that far from a low-power vaccum cleaner. I kept the stock heatsink+fan of my 955 BE for... 5 days. It was waaay too loud. If your computer is in your room, forget about having it fold 24/24 otherwise you won't sleep. Even if you don't use the CPU, it'll be loud as hell.
With speedfan, I saw that whatever the load on the cpu was the fan was between 5000-6000 RPM...
If i were you, i wouldn't even bother with the stock heatsink and buy something better. That way you won't have to clean the stock thermal paste. You can find some pretty awesome HS for 30$, my CM 212+ cost me around 23$.
To sum up: You don't care about noise: no problem. You care about noise: you won't stand this small reactor in your PC case.
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