66 degrees C OK?

Hi, I recently built my first computer (thanks to the help of a few people on this forum) i then unlocked an
extra two cores on my AMD Phenom x2 955 to make it a quad and overclocked to 3.49 Ghz. (again thanks to this forum)
I then tested my system with Prime 95 for over an hour and recieved no errors. But i wanted to check my temperatures are ok.
ive got the stock heatsink + fan for my cpu plus two other fans that came with the case. according to Hardware Monitor my highest cpu temp (when using prime95) was 66 c and the lowest 48 c. Is that ok?
when i watched it only ever stayed on 66 C for 30 seconds or so, the highest temp it stayed on for a long amount of time was 64 C and the lower temps varied alot.
What do you think? is that OK?

I'm not familiar with that CPU but 66 doesn't sound in any way excessive to me. Were the case fans fitted when you bought it? I ask only because some folks think they're supposed to draw air into the case and not exhaust hot air out.

I've got the Phenom II 965 and 55 c is fine, good in fact. Phenom's can easily go up to 80-90 c with stock coolers. I've got a pretty big custom air cooler on mine and it sits around 35 idle and hit's 55 when playing games.