Remember there are two E6300's.
One is 1.86ghz and is 65nm and the other is 2.8ghz and 45nm. Obviously you don't have the 65nm one though.
If you showed us a screenshot of cpu-z with the cpu at stock speed I could answer your question. Your fsb overclock is confusing cpu-z.
What does CPU ID Hardware monitor show it as? Bios?