@KTE: so it seems You absolutely MUST rerun it with C2D.
I will compare it to the Celeron "Conroe-L" - simple CW can produce ~1sec difference in 1M and ~40s in 16M - with C2D the difference is nothing [1M] to ~3sec [16M].
So it depends on many things, but yes, 30% difference is absolutely worth analyzing .