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I've got i7 processor, 8 GB of RAM, integrated Intel HD Graphics 3000 and GeForce 540M in my notebook. For some reason in "Edit > Performance > Graphics Processor Settings" Photoshop CS6 sees only Intel HD Graphics 3000 card and it works so slow that I can't do anything. When I disable that and check it to use CPU only, it works even slower.
I've searched Google for similar issues but nobody seems to have it. Does anyone know if I can switch to GeForce somehow? I don't see such option in the settings.

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What is your monitor hooked up to? Are you using Virtu or anything like that?
– David Schwartz – 2013-12-20T13:56:55.083Are you on a laptop or desktop? Have you tried updating your drivers? Have you tried disabling the integrated graphics completely? – DanteTheEgregore – 2013-12-20T14:18:41.807
Doesn't Windows just use one graphics card? Have you checked what graphics card windows is using? I don't know much about graphics card models but are you saying you've got two graphics cards integrated int your notebook? an Intel..3000 and a GeForce.. ? Photoshop aside, what is windows seeing? surely photoshop just sees the one windows sees? or can photoshop use a different one to what windows sees?!?! – barlop – 2013-12-20T15:12:00.460
@DavidSchwartz I have Dell XPS 15 and Windows 7 uses Intel HD Graphics 3000 most of the time. I don't have any other software or hardware. Just fresh Windows with default drivers (last updated today). I noticed that 540M gets activated when I'm launching some game or occasionally but not always a HD movie. It always switches to GeForce when I plugin in HDMI monitor too. Other than that it uses integrated card. – Plon – 2013-12-20T15:56:24.827
@barlop See David Schwartz's comment. Windows can utilize multiple graphics cards in different scenarios. – DanteTheEgregore – 2013-12-20T16:23:08.833