ScienceMark 2.0, Pifast
Let's hit upon ScienceMark 2.0's memory bandwidth and latency first. It's usually a decent indicator of overall performance, but the release of dual-core models puts its predictive ability at risk.
Nothing much to choose between single- and dual-core Intel models here. They both share a single system bus, though. AMD's Athlon 64s always come out on top here.
Access latency has always been an Athlon 64 forte. Note that the use of Corsair's low-latency DDR2 RAM has reduced most LGA775 CPUs' memory access latency to <80ns.
Here's how it all pans out in Pifast. Remember that the 3.8GHz-clocked Pentium 4 670 and 570J are, in performance respects, separated by the former having double the L2 cache. It makes a small difference here. Pentium D 820's lowly 2.8GHz clockspeed and the single-threaded nature of the application hurts performance, as expected.
