There are different modes of the AMD 64 bit cpus. one has 512K L2 Cache the other has 1024L2 Cache.
Check to make sure that it doesnt have 1024K L2 Cache. Either CpuZ or Sisoft should show the cache. If its not 1024K i would save the webpage that you saw online to your harddisk(leagal purposes) and call the company back and tell them you want the model with the 1Meg of L2 Cache.