This is common knowledge for those who have followed server technology. Adding more processors does not mean increase in performance.
From the article:
As cores shut off, overall performance rises, particularly at the dual-core mode. With most of the chip offline, performance jumps. One potential conclusion that would explain these results is that applications are poorly threaded, which prevents them from taking advantage of higher core counts. But the fact that performance increases at the two core mark suggests something more fundamental at work — the chips in question are hitting their thermal trip points unless more cores are shut down.
As things stand, there are some benefits to quad-core devices and virtually no gains from octa-core. In a few cases, moving to more cores actually makes things worse.
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