I own a Dell E6410 ATG. I have recently upgraded to Windows 8 Pro and am enjoying the new features of Win 8 Pro. When I got the computer it had a 32 bit version of Windows 7 on it. So I used the 32 bit version of Windows 8 Pro when loading the new OS. But as I read the specs of the now discontinued Dell E6410 ATG it shows that it was capable of operating using the Windows 7 64 bit OS. I also maxed the Memory (ram) out at 8GB. It appears that I may be able to use more of the installed memory if this computer was using the 64 bit architecture. I am not technically brave enough to just attempt loading the Windows 8 Pro 64 bit OS and see if it works. Has anyone here tried this or have any input on this?