Samsung series 7 laptops - graphics card & clock speed Qs

2 questions

#1 - How much can the battery life vary between having these two graphics options, if any?

AMD Radeon™ HD6750M (PowerXpress)

NVIDIA® GeForce® GT 640M Graphics


#2 - Does samsung limit CPU clock speed somehow for heat/battery? Their website lists the i7 3615QM as having a "max clock speed" of 2.3ghz whereas the normal 3615QM is 2.3ghz with a max turbo boost of 3.3ghz

Any other opinions/input on this laptop line is also welcome, thanks
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More about samsung series laptops graphics card clock speed
  1. The Samsung Series 7 is not something I would recommend in most cases, because its display is very poor in quality. Its resolution (1600x900) is good for its size (15.6") but the low contrast of the display gives it an overall grayish look and prevents it from producing a dark black.

    Check out the MSI GE60 instead. It's still lightweight for a 15.6-incher (at 5.28 lbs), and it comes with a faster GPU (GT 650M or GTX 660M) and much better display (15.6" 1920x1080 w/ good contrast).

    MSI GE60 0ND-006US (i7-3610QM, NVIDIA GT 650M, 15.6" 1920x1080 matte display) - $1099 no tax
    - http://www.amazon.com/MSI-Computer-GE60-0NC-006US-15-6-Inch/dp/B007YDHLYE/ref=sr_1_2?ie=UTF8&qid=1341841468&sr=8-2&keywords=ge60
    - http://www.newegg.com/Product/Product.aspx?Item=N82E16834152339

    MSI GE60 0ND-042US (i7-3610QM, NVIDIA GTX 660M, 15.6" 1920x1080 matte display) - $1199 no tax
    - http://www.amazon.com/MSI-Series-GE60-0ND-042US-15-6-Inch/dp/B0082JFCZ4/ref=sr_1_1?ie=UTF8&qid=1341841468&sr=8-1&keywords=ge60
    - http://www.newegg.com/Product/Product.aspx?Item=N82E16834152349
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