Processor and video adapter question

Hello,
I am trying to decide between a laptop with an i7-2720QM or an i7-2620QM or an i7-2520QM, and either an Intel HD Graphics 3000 or Nvidia NVS 4200M 512MB DDR3 Discrete Graphics card.

I use the laptop for business applications, not gaming. I do lots of multitasking, but not much in the way of video or demanding graphics.

I would appreciate someone educating me a bit on how to make a choice. Thanks.
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More about processor video adapter question
  1. You have some nonexistent CPU model numbers up there. What are the actual laptops you are looking at? If you want good multitasking, then get a "QM" processor. HD 3000 gfx is good enough if you wont be using much 3d applications.
  2. Well, I'm looking at a Dell E6520, and the processors are listed as: Intel Core i7-2720QM processor (2.20 GHz with Turbo Boost 2.0 up to 3.30 GHz), or Intel Dual Core i5-2520M, 2.50GHz, 1066MHz 3M L2 Cache, or Intel Core i7-2620M processor (2.70 GHz with Turbo Boost 2.0 up to 3.40 GHz). Sorry if I didn't provide enough info.

    So there is no benefit to getting the Nvidia gpu unless I'm doing 3d?
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