Phew thanks people!
I have a Corsair Carbide 300R case, I think it will fit but I'm a bit new to all this.
After having a second look at it, I'm not 100%
convinced it will fit; that cooler is remarkably tall. But, as you already have the cooler, you can certainly give it go and find out for sure. Just double check and be aware of the return policy for where you got the cooler from; some retailers don't like taking back opened products.