2011 MacBook Pro Turbo Boost problem may be larger issue than originally thought

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Date: Tuesday, March 22nd, 2011, 05:57
Category: MacBook Pro, News

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The good news is that the new 2011 MacBook Pro notebooks are out and they are generally considered speedy and awesome.

The bad news is that Apple may have been aware for some time of the problem of new MacBook Pros crashing under heavy loads. According PC Pro magazine, Apple appears to have deliberately turned off Turbo Boost for the top-end 13″ model (with a dual-core 2.7 GHz Intel Core i7-2620M processor) when running Windows under Boot Camp.

PC Pro originally thought that Turbo Boost had been disabled under OS X as well, but then tests performed by AnandTech showed that the feature was only disabled under Windows. “We first noticed a problem when the benchmarks finished five full runs and the results popped up on screen: the times taken to complete several of the most intensive tests were rising with each run” says PC Pro. “This would suggest an overheating problem, so we ran a temperature monitor to find out how hot this Sandy Bridge CPU was getting.”

In fact, the CPU was reaching around 93°C — almost 200°F. “93°C is not necessarily too high for a modern CPU, but it is the root cause of the bigger performance problem.” The magazine went on to state that it was sure the processor isn’t turning off Turbo Boost dynamically, since it didn’t work at all during their week of testing no matter what the CPU temperature was. Also, the cheaper model with the i5 processor did use Turbo Boost, as did the i7 model under OS X.

After measuring the underside temperature of the top-end model at 60°C — 140°F — they conclude that it might actually be a better deal to buy the cheaper 13-inch MacBook Pro. If Turbo Boost is disabled on the higher model, the lower-end version will actually run Windows faster than the more expensive MacBook Pro.

Stay tuned for additional details as they become available.

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