"The youngest Pentium D processors based on the new Presler core didn�t prove up to our expectations. Despite the improvements introduced by the manufacturer such as larger L2 cache, they are still unable to successfully compete against the rivals from the same price group in the majority of tasks. In fact, Pentium D 920 and Pentium D 930 can only prove faster than Athlon 64 X2 3800+ (the youngest dual-core processor from AMD) in office applications and selected synthetic benchmarks. That is why the only way Pentium D can become popular is due to its $60 lower price than that of Athlon 64 X2 3800+. From all other standpoint, it may not be the best purchasing decision to make at this time.
Unfortunately, the great overclocking potential allowing to speed these processors up to 4.0GHz can also hardly become a convincing argument in their favor. According to our tests, Presler based CPUs working at 4.0GHz cannot outperform Athlon 64 FX-60 working at 2.6GHz only. As a result, we have every right to claim that the overclocked Athlon 64 X2 will be mostly faster than the Presler based overclocked Pentium D processors."