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The dual core processors intel core i 5 -2557M (1.7 GHz), Core i 7 -2637M (1.7 GHz) and Core i 7 -2677M (1.8 GHz), work at lower frequencies and have approximately doubly lower TDP in comparison with the standard processors generation sandy bridge. All three processors consume not more than 17 watts of energy, which transfers them in ultra low voltage (ULV). All models (with exception Of core i 5 -2557M) have two computational core, integrated video, 4 Mbytes cache in the third level, and regime turbo boost allow them to be overclocked by 1.1 GHz. Core i 5 -2557M has the same two core and built-in video, but the L3 cache volume is equal to 3 Mbytes, and Turbo boost give addition by 1 GHz.
There still a fourth processor from the same series ULV, Intel celeron 847. Its frequency is only 1.1 GHz, it do not support hyper-Threading and Turbo boost, has only 2 Mbytes cache in the third level and is intended for budget notebook models .
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