Have a look at The Mother of All CPU Charts 2005/2006
. It is a bit out dated (nov 2005) but it compares AMD
with Intel, single core and dual core mixed.
It is difficult to compare single core with dual core because the processors aren't exactly the same:
The "Athlon 64 3200+ Clawhammer", "Athlon 64 3200+ Venice" and "Athlon 64 3200+ Winchester" are running at 2.0 GHz with DDR400 RAM
and they perform differently in different tests/benchmarks. (The "Athlon 64 3200+ Newcastle" is running at 2.2 GHz and can not be compared.)
Compare those with the "Athlon 64 X2 3800+ Manchester" which also runs at 2.0 GHz (2 x 2.0 GHz) with DDR400 RAM
The designations indicate the respective performance differences but I have no idea how they reached the values. 3800/3200=1.1875 but the SiSoft Sandra benchmarks (for what they are worth) indicate between approximately 0.9 - 2.0. Yes, some benchmarks indicate that the single core is better than the dual core ...
... at the same CPU
Enjoy your read ...