Tom's Hardware Guide compared the Athlon 64 X2 from AMD with Intel's Pentium EE:

The questions to be answered are: how do these most powerful of CPUs behave under full load and how do they handle rising temperatures resulting from the tremendous amount of waste heat generated? We also deal with the topic of power consumption, as the cost of electricity and energy continues to go up all the time. Thus a new criterion in the evaluation is computing performance in relation to power consumption costs generated. This makes efficiency decisive for determining the winning platform in the stress test. Two graphics cards in an SLI combo were added to the systems in order to ensure high graphics performance as well.



Link: Tom's Hardware