The new Chrome from Google to find more CPU in your GPU.
Google Releases Update for Chrome Browser to v18 : Read more
Google Releases Update for Chrome Browser to v18 : Read more
Why?
Do you plan to make your broser use more than 2 GB (on 32 bit OS) or 4 GB ( on 64 bit OS) ?
It's not like 64 bit is inherently faster than 32 bit, it just allows more memory to be addressed. Actually sometimes 64 bit can be slower, due to larger program sizes (2x pointer size), less efficient cache use (fewer instructions or data fit in the cache) etc ...