The tests run on the Nehalem processor involved two scenarios, the first in which symmetrical multithreading (SMT) was enabled, the second in which it was not. SMT is a technology specific to the latest Intel Core microarchitectures, developed under the codename Nehalem, which makes it possible for each core to run two simultaneous threads. This means that the quad-core Xeon W3540’s can run up to eight threads simultaneously, two per core.

Windows 7’s scores were unquestionably superior to those of XP according to the results provided by the SPEC Viewperf and Cinebench. Of course so were Vista’s. However, users should take note that the benchmark in question involves Windows Vista Service Pack 2, a release that was made available in mid-2009, when the development process of Windows 7 was approaching the end.

The Windows 7 advantage is indeed significant. Note that this 17 percent decrease in power consumption is for the exact same software running unchanged on the same machine.

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