it seems that the sempron line will recieve the 64 bit support, by the end of 2006-7 it is estimated that at least 30-50 percent of people will be switching over to 64 bit technology full story on the sempron http://www.tomshardware.com/hardnews/20050707_151857.html
hmm, first time im hearing this, maybe some awesome guy out there (or gal) will find out a hack to unlock then GO AWESOME GUY/GAL!
http://www.theinquirer.net/?article=23845 has something to say but doesn't clear up much. I do remember hearing something like that though.
I said this months ago can't remember where. A socket754 Semron is a cut down A64 Hammer. It has half the cache and x86-64 disabled. It makes sense since they don't have to redesign a whole new CPU.