Aside from the inclusion of a variable speed pump, the NZXT Kraken X61 improves from it’s predecessor by including a massive 280 mm radiator with a denser fin array which accounts for 36% more surface area. NZXT has also given the Kraken X61 extended tubing to ensure compatibility with all installation environments. Included with the Kraken X61 are two FX140 V2 PWM fans which according to NZXT are more powerful, quite, and durable than the inclusions of it’s predecessor. Most importantly, the Kraken X61 has a 6 year warranty, which just goes to prove how confident NZXT is of the Kraken line.