Piz Daint has been climbing up the Top500 supercomputer list since November 2012, when it took 114th place with its 1,504 Intel Xeon E5-2670 processors.
Since then its owner, the Swiss National Supercomputing Center, and manufacturer Cray have performed a number of upgrades. After six months they tripled the number of processor, catapulting Piz Daint to 42nd place, and then after another six months added Nvidia K20x accelerators, boosting it to sixth place.
In 2016, Cray switched the Xeons to a newer model, the E5-2690v3, each with 12 cores instead of the 2670's eight, and replaced Nvidia's K20x accelerators with the newer Tesla P100. A final boost to the number of processors pushed Piz Daint into 3rd place in June 2017, and it hadn't been overtaken by November.
Its 361,760 cores deliver maximum sustained performance of 19.59 petaflops and peak performance of 25.33 petaflops.
At 8.622 gigaflops/watt, it can't approach the power efficiency of Gyoukou, but it beats everyone else in the top 10.