I downloaded the Ramdisk from here. It’s free if your ramdisk size is less than 4GB. It works for my Windows 7 x64 version. It saves and load the ramdisk image when you shutdown or boot your computer so it’s really painless.
Then I moved my Chrome cache to the Ramdisk by copying the “User Data" directory from “C:\Users\<UserName>\AppData\Local\Google\Chrome" to “D:\TEMP". Then modify the Chrome shortcut and add the parameter
--user-data-dir="D:\TEMP\User Data" after chrome.exe.
Reference: http://solnyshok.blogspot.com/2009/05/windows-7-x64-ramdisk.html (but you don’t need all that hacking mentioned because the software is not beta now)