Shouldn't this work?

[Wayne Topa <linuxone@intergate.com>]

I just purchased a set of DVD's to install Debian Etch (4.0) on my
system.  I also got a Ubuntu Ver 6.06 AMD 64 DVD to see how a amd64
compared to the K7 I'm currently running.

On bootup the Ubuntu DVD say that I am not running on a amd64 box.
Here is what /proc/cpuingo says:
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 4
model name      : AMD Athlon(tm) processor
stepping        : 2
cpu MHz         : 1000.123
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow up
bogomips        : 2002.13

Did I misunderstand somthing?  I 'thought' I read that the Athlon 
was a 64 bit processor.  Am I wrong, again?

Thanks
Wayne