When Should MBP (2011 2.5 core i7) Switch Graphics Cards ?

All
I have a late 2011 2.5 i7 MBP with 8GB that seems to always use the AMD rather than the Intel even when I am just doing things like browsing the web or working in Excel etc. This seems strange as I assumed it would only switch when absoutely needed for things like gaming etc.
So, with that said when should I expect the GFX card to switch and should I be concerned if when I check (about Mac) it shows AMD most of the time ?
What is funny is after I did the EFI update I saw the Intel sho
Thanks

OM
Thanks for the quick reply. My concern however is that my new MBP is using AMD when on battery. Specifically certain apps (using GFXcardstatus to find out which): Postbox, Coffee Break etc are causing this to run. I am fine with it doing this if it wasnt impacting battery life. So far on this brand new MBP 2011 late 2.5 I am seeing battery indicator showing about 3.5-4 hours on full charge even though I am just browsing, sending email, working docs etc.
This does not sound right when you see the 7-8 stated hours for this unit.
Thoughts ?
Thanks

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Here's the problem, i got a MacBook Pro 15.4" 2.4 Ghz Intel Core 2 Duo, 2 GB Ram (Late 2007)(specs http://support.apple.com/kb/SP13), and i was using it and everything went perfectly normal, last night i turned off with the DVI to VGA adapter connected, cause sometimes i use it to see movies in the Projector, this morning i tried to turned on, (still the adapter connected), and the display never turned on, stayed all black and not sent image to any external display. I Have tried everything, i know it's probably just asoftware thing cause i can acces it thru screen sharing with my other computer, I have tried reseting the PRam, put it on target mode, starting it with the Snow Leopard Original disc by pressing C, etc. then i access it again thru screeen sharing and i went to system profiler, and there in the Graphics/Display Section it tells me that my VRAM is 64 mb and that it's shared with the System memory, but thats not true this computer came with an NVIDIA GeForce 8600M GT with 256MB of GDDR3 SDRAM and dual-link DVI wich is not shared and obiously not 64 mb, i'm trying to figure out if it's a hardware failure or a software failure, and if it is hardware what do i need to replace.
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http://forums.macrumors.com/showthread.php?t=1269257
http://forums.macrumors.com/showthread.php?t=1365904
http://myworld.ebay.com/macvidcards/
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http://forum.netkas.org/
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"Hacked" is not my terminology, and I don't believe it's intended to be derogatory. What you describe is a perfectly legitimate reason to alter Hosts.
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Back up your Mac if you have not already done so. To learn how to to that read Mac Basics: Time Machine backs up your Mac - Apple Support
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When Should MBP (2011 2.5 core i7) Switch Graphics Cards ?

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