The first thing that comes to mind is bad yields, but I am told this is not the case for the three-core product lines.

IBM will introduce three new EX5 systems including four-socket and two-socket rackmount servers and a blade server. The servers will use Intel's upcoming eight-core Nehalem-EX processor.

The experiment shows that the speedup 1.93 is gained on the multi-core platform with three processors, which proves that the parallelization method proposed can achieve a good performance.