xp and xp 64 on amd64
In my humble opinion....
Yes you can load both xp pro and xp pro 64 on a pc with an amd64 processor. However, I wouldn't say that either one is "just as good".
In my case the 64 version loaded easily on a seperate hard drive. (I did this because I did not want to risk my stuff on my regular drive with XP PRO.) However, my printer is an epson stylus cx6400. I have yet to find a 64 bit driver for the printer. As such the XP PRO 64 is of little value. When it comes to an operating system in my house that answer is clear "No Printer?" "NO WAY!!!"
Another major issue with xp pro 64 is the lack of antivirus and firewall support. Anyone who opens a network connection without that is an ***** and should box their computer up and send it back to the factory. They are obviously too dumb to use it!