64-bit Windows support is coming to Chrome Stable with the release of Chrome 37. The native version of Chrome has improved speed on many of our graphics and media benchmarks. The VP9 codec thats used in High Definition YouTube videos shows a 15% improvement in decoding performance. The only significant issue is the lack of 32-bit NPAPI plugin support. The 32 bit channel will remain fully supported for the foreseeable future and we will continue to support 32 bit plugins until NPAPI is removed from Chrome.”]
Source: https://blog.chromium.org/2014/08/64-bits-of-awesome-64-bit-windows_26.html