Google have recently released a new updated Chrome browser for 64bit devices. Compared to the 32bit browser which can only use up to 4GB of RAM, the 64bit Chrome browser will now be able to access and use more than 4GB of RAM from the host device.
From a security point, the Chrome browser security features have been improved in the 64-bit version, primarily by having access to a larger pool of memory. Windows has a built-in security feature called ASLR (Address Space Layout Randomization) which makes developing bug exploits more difficult to write by randomizing the location of important items such as DLLs ( Dynamic-link Library ) in memory. Because the new version has much more memory available, bug exploits are difficult to create, and with more memory to work with, the process becomes even harder for hackers to exploit.
The new 64bit Chrome browser can be downloaded directly from https://www.google.com/chrome/browser/?platform=win64