Q9450 Stock/OC temps

[coolchu001]

I have my Q9450 running at 3.62GHz and after 10mins of prime95 I hit around 58C max. I leave the cpu on idle for another 20mins and it idles at 44-45C for core 0 and 41-42C on the other 3 cores. These temps aren't too bad. Just out of curiosity I wanted to see the stock temps so I put it to the stock clock of 2.66GHz. Waited 30mins on idle and the temps were 41C on core0 and around 38C on the others. After 10mins of prime95 on the stock clock I get 54C on core0 and 50-52C on the other cores.

There isn't much of a difference on these temps at two very different clock speeds, why's that?

The temps were obtained using real temp 2.5

FYI this system was put together last night, so the AS5 may need more time to cure...