Amd64 5000+ X2

I looked at the screen shot for this program http://www.majorgeeks.com/NovaBench_d5909.html and was confused by what I saw... an AMD64 5000+ X2 running at 3200mhz?!?!? The factory speed for this CPU is 2600mhz. So, is this an overclock? 600mhz seems to me to be a pretty decent OC if it's stable.... I'm running an AMD64 5400+ X2 at stock speed which is 2800mhz. I don't really have a need to overclock; it runs great and there's zero lag in everything I do from surfing, to gaming, to whatever. BUT- if I were to overclock, could I expect to get a 600mhz (or better) increase? Just curious...
Thanks.