You can't directly compare their speeds, only their performence.
To compare one CPU to another, you ignore clock speeds and just go look for head to head reviews/comparisons in games, programs or applications. If you want to compare AMD and Intel CPU's when overclocked, they need to be equally overclocked for fair comparision, if one is 30% overclocked then so to must the other be.
There are plenty of review websites.
Right now at this moment intel has the crown in pretty much all ends but price.