Quad-core i7s vs dual-core i5s with higher clock speeds

I briefly included my concern in an otherwise unrelated thread in the laptop section in which I was asking for overall impressions on which laptop to go for, but being new here, hasty me overlooked this section. I apologize if this is seen as excessive posting about the same issue, but I believe this section can better assist me with my problems aside from the other laptop components, which I'll leave solely in the other thread. I'm having an issue deciding on which laptop CPU to go with. First off, though I realize the general impressions are more cores are better, I was worried that for gaming in particular (nothing major, not expecting much, just the best I can get for the money), where the additional two cores of quad cores go underutilized a lot, especially with the relatively older games I'll be playing on my laptop, that a quad core i7 with lower clock speeds will perform less well in comparison to a dual-core i5 with higher clock speeds. In particular, the three laptops I'm considering as well as their respective CPUs are (GPU differences are negligible, as far I know... GT 630m vs GT 540m):

http://www.microcenter.com/single_ [...] id=0388092 - Asus R500VM-MS71 - i7-3610QM 2.3 GHz, 4 cores (3.3 GHz with turbo boost)

http://www.toshibadirect.com/td/b2 [...] 2000016420 - Toshiba Satellite P750-BT4G22 - i7-2670QM 2.2 GHz (3.1 GHz with turbo boost)

http://www.toshibadirect.com/td/b2 [...] 2000016417 - Toshiba Satellite P740-BT4G22 - i5-2450M 2.5 GHz (3.1 GHz with turbo boost)

I realize the 3610QM is better than the 2670QM, but by how much? Enough to make choosing the Asus over the Toshiba, which I otherwise prefer, justified? In addition, I don't quite understand when/how turbo boost complicates things. Can I force turbo boost to enable at my will, washing away my fears of an i7 with lower default clock speeds being weaker in game performance than an i5? Any assistance with what to do, in both comparing the two i7s and deciding between quad-core i7s with lower clock speeds vs dual-core i5s with higher clock speeds with turbo boost as a factor. Thank you.
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More about quad core dual core higher clock speeds
  1. A couple hundred Mhz wont make a huge impact on any gaming but the lack of cores when you need it will. I went with a 2670 when I got my laptop but given the 2 i7's gett he one with the better gpu, you wont notice th 100mhz clock speed difference.
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