I'm not sure. The E6300 is installed now and I don't have any problems. Its just not a fast as I thought it would be. The Pentium D on paper looks like it should be faster. 3.2 mhz, 4mb of l2 cache, ...That's why I was asking.
If the D2C was close or not much faster, I was going to return it and put the old processor back in.