pls explain Amd numbering

[michael <linux@networkingnewsletter.org.uk>]

On Tue, 2005-06-07 at 10:58 -0500, John Hasler wrote:
> Robert Storey wrote:
> > I believe that K6 is compatible with 486 and even 586.
> 
> hasler/~ uname -a
> Linux hasler.dhh.gt.org 2.2.12 #1 Mon Oct 4 22:06:49 CDT 1999 i586 unknown
> hasler/~ cat /proc/cpuinfo
> processor       : 0
> vendor_id       : AuthenticAMD
> cpu family      : 5
> model           : 6
> model name      : AMD-K6tm w/ multimedia extensions
> 

Now I am confused since my bios says my chip is amd k7 athlon 4 but
cpuinfo gives

michael@manchester-campaigns:~$ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 6
model name      : AMD Athlon(tm) 4 Processor



> -- 
> John Hasler
>