Technically, the Titan is the world's largest and heaviest fanless CPU cooler. The 2kg monster is so massive that it must be attached to the case itself. The Titan is not available as a stand-alone product but is exclusive to Silentmaxx's custom fanless PCs. Cooling-wise, it's impressive and slightly better than the Noctua NH-P1: "The limited information on the Silentmaxx website suggests incredible performance for the Titan – 250W in passive mode and up to 400W in active mode. However, the reality is different, and in passive mode, it can cool 130W and around 230W in active mode. These are still great numbers".
Source: pc.sk