Google has just released a stable build of Chrome 37, which is now available in a 64-bit version for Windows. The 64-bit version of Chrome offers plenty of enhancements over the 32-bit version, such as a 15 percent improvement in decoding performance when using the VP9 codec, as well as greater engine stability when handling typical web content. Security is also improved, as the 64-bit version of Chrome is more effective at defending against vulnerabilities that rely on controlling the memory layout of objects.
The 64-bit version of Chrome 37 is only available through a new download link on the Chrome download page, with the only known issue being that it lacks 32-bit NPAPI plugin support.
Source: Chromium Blog