Difference between apparently similar processors?

Is there as noticeable a difference in performance between the following processors as there is in their price?
2nd generation Intel(R) Core(TM) i7-2670QM (2.2 GHz, 6MB L3 Cache) with Turbo Boost up to 3.1 GHz 
2nd generation Intel(R) Core(TM) i7-2820QM (2.3 GHz, 8MB L3 Cache) with Turbo Boost up to 3.4 GHz
And what is the difference between the first processor listed above and the dv7t's:
2nd generation Intel(R) Quad Core(TM) i7-2720QM (2.2 GHz, 6MB L3 Cache) w/Turbo Boost up to 3.3 GHz 
Specifically:
Is there any difference in speed or amount of lag when gaming or doing regular web surfing?
Is there a difference in heat when using the laptop?
Thank you!

JTChal wrote:
And what is the difference between these graphics cards?
1GB GDDR5 Radeon(TM) HD 6490M Graphics [HDMI, VGA]
1GB Radeon(TM) HD 6770M GDDR5 Graphics [HDMI, VGA]
2GB Radeon(TM) HD 6770M GDDR5 Graphics [HDMI, VGA] 
Hi,
You can see 6770M has two versions. The 2GB has more RAM the 1GB. ect.  
This is a good place to start with:
   http://www.notebookcheck.net/Purchase-Consultation.13212.0.html
Regards,
BH
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