NOCTUA (HxWxD) 160mmx140mmx158mm
It should be fine.
If you are looking for something smaller and prettier, the Zalmans CNPS 11X is great, not to much of a drop off from the Noctua, has smaller dimensions and keeps your system cool. I have summer ambient temps of around 28-34 degrees centigrade and the cooler keeps it around the 28-32 range, 45-55 load. (running stock speeds)
That said the Noctua is a great unit.