How important is a graphics card for running an extended desktop?

bnot

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I'm looking to buy a decent i7 (probably 2760qm) based laptop as a desktop replacement on which I will mainly want to work hooked up to an external 1920x1080 monitor on an extended desktop basis (using Windows 7) with the laptop's own display becoming the second screen. How important is the graphics card in such a scenario?

Should I be looking for something with a separate graphics card or will the i7 cope well enough running both displays without any noticeable slowdown? I'll running occasionally processor intensive but graphically light software (i.e. MS Visual Studio) most of the time, with the occasional use of Flash. No gaming capability required though. Thanks!
 

MKBL

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The only possible bottleneck is the laptop's natural resolution. If it is below 1080, but your desktop monitor is 1080, the output to the desktop monitor will be limited to the laptop resolution. The desktop monitor can be 1080 in this case, only if the laptop screen is disabled.

I haven't played with latest laptops for a while, as my two laptops were 6,7 years old (all dead by now, although I will try to restore one this weekend), so my statement above is limited to the laptops up until a year ago with IGP that I helped my friends tweak . Not sure about the current generation laptops, and/or with discrete graphics.

EDIT: With separate graphics card, you may output different resolution to the external monitor. Right now my desktop is connected to 1440 x 900 and 1920 x 1080 monitors with their natural resolution, the former via motherboard DVI connector using HD 2000 IGP, the latter via GTX 560 Ti 448 Core DVI. Why not with a laptop, if it works in desktop?
 
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