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From Bruce Herndon in the VMware performance group: Comparing Intel Dual-Core and Quad-Core Using VMmark

The systems achieved nearly identical benchmark scores for one and two tiles. This behavior was expected since neither system had exhausted its CPU resources. At three tiles, the dual core system was fully utilized, which limited the score, while the quad core systems continued to scale well due to the additional available CPU resources. The quad-core system delivered a 28% higher score with three tiles. The quad-core system became saturated at five tiles and ultimately achieved a score 70% higher than the dual-core system while supporting 67% more VMs.