I've encountered some problems after installing the second card. With the asus maximus V etreme i flicked through the manual and it states if wanting to use dual graphics cards you will require at least a 1000watt power supply for the benefit of stability.
On installing both cards my first one works fine but the second i'm having issues with. I uninstalled drivers like stated and placed both cards in, windows driver auto-detect works its magic and installs first card. The second card after windows driver installation it will flip the card into what i assume to be safe mode with a purple light instead of a blue one (blue light being the same color as the working card and the same color the second card is until windows auto driver install) and a green small LED light will come up on the card (all references i can find on the internet say any green light on an asus card is safe mode)
I've tried to install the latest catalyst and have just been receiving random blue screens of death aswell as a complete loss of signals on both monitors. It also corrupted my .net framework 4.5 due to me having to reset mid catalyist install because there was no signal to the monitors for over 3 minutes.
The only thing i can think is it's a serious lack of power or the windows driver auto install is causing this issue. but it manged to install my first card with basic drivers no problem and the second is an identical card.
but i am pretty sure it's a power issue what are your opinions
If it is a power issue i'm thinking of this one: