Performance
The first two chassis to be tested with our new hardware configuration are similarly matched in terms of size and target audience, and both enclosures are able to serve up enough airflow to keep our overclocked Core i5 chip running suitably cool under full load. Fractal Design's Define S has the edge, and we assume that's due to a direct airflow path - the Silencio 652S's array of storage bays must be stifling the front intakes somewhat.
There isn't much between the two when it comes to cooling the dual GeForce GTX 970 graphics cards. The Define S once again has a slight advantage, but the Silencio 652S does have an optional side mount for an extra fan that would no doubt shave a further few degrees off what's already a comfortable temperature.
Yep, these two are closely matched in many ways. Though, to our ear, Cooler Master's fans seemed more audible than Fractal's - they create a more distinct sound - and the trusty noise meter has backed up our initial impressions. That said, both enclosures do a good job of keeping noise levels below average. We consider < 30dB at idle to be barely audible and < 36dB while gaming with two powerful GTX 970s is nice and quiet.