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it's in french but maybe it can help :
http://imgur.com/KYHG3Zf
How is that even possible? Your video card is direcly connected to your monitor. Unless your second card is ALSO connected to your monitor (which I find hard to believe as that would be utterly pointless, esp. with an integrated chipset), the game can't "choose" to use the other card. Even if it did, you'd never get any picture from it on your monitor, as far as I understand things.
Maybe your fps increase was due to some other factor?
What will happen is that the driver will detect two devices and will give them ordinals. The game will go through code that enumerates the devices and will pick one. Since it has no idea which card is better it will likely pick ordinal 0 which would likely be the onboard card. This is why I always disable onboard cards so there is only 1 device. Now 1 device might have 2 heads (dual head) which means you can do true dual screen (not the fake dual extended Windows desktop ) but it is still one device in the list.
I cannot see how this is a Steam issue since the device selection and enumeration is performed by the game setup code.
I think it is the CUDA gpu. I chose the other option instead of the global settings and it seemed to work.
Maybe I'm a bit out of date here, but how is that PHYSICALLY possible if the monitor is connected by the video cable to only ONE card? Would the motherboard actually "stream" the video from the integrated chipset through the dedicated card's PCI slot and circuitry into the VGA/HDMI output socket? If so, that would be one hell of a mess IMO.
Anyway, I've got some integrated video on my Nvidia motherboard, but this issue sure as hell never came up for me. All I ever saw was output from my dedicated videocards.
Same. I can't find what they are talking about in my Nvidia Control Panel.