Can't use Slot 3 for a graphics card

[riggles]

I'm trying to space out my Titans to give them a little breathing room, but moving the second card up to slot three gives me a blank screen on booting up. I've tried using only one display (using with DP or DVI) and no dice. Moving it back down to the second slot, everything is fine. I wonder why that is?

I know slot 3 is slower, but I'd still like to test it out. Running 10.9.3 with latest web drivers on a 2010 5,1. Any ideas?

 

[Prince134]

I'm trying to space out my Titans to give them a little breathing room, but moving the second card up to slot three gives me a blank screen on booting up. I've tried using only one display (using with DP or DVI) and no dice. Moving it back down to the second slot, everything is fine. I wonder why that is?

I know slot 3 is slower, but I'd still like to test it out. Running 10.9.3 with latest web drivers on a 2010 5,1. Any ideas?

Mine 5.1 can work with slot one for Titan Black, slot 3 with Gtx 680.
There is a glitch with newest web nvidia driver , make sure while you can see the screen, turn off "mirror display", or GTX 680 will display at low resolution at 680x480.