So, I have two evga 670 gpu. They were fine and all until a month ago, when my display driver kept on crashing at least once a day. Now, it doesn't say that as frequent, but my computer keeps on freezing at least 2-3 times a day. When I watch videos, I've noticed most of voices are out of sync. In addition, my computer feels a bit slow when it is starting up. After I restart my computer a few times, it gets better. I uninstall the driver and download the latest one again. But, it still kept on crashing, so I am currently using the older version of the display driver.
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_gdr.120830-0334)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 06/06/12 20:50:07 Ver: 02.57
Processor: Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz (8 CPUs), ~3.5GHz
Memory: 16384MB RAM
Available OS Memory: 16336MB RAM
Page File: 2963MB used, 29708MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
I'm not sure, haven't tried using a gpu individually cause I use a sli bridge to connects both my gpus. Not sure if I can tell from my monitors, but I have a monitor for each gpu and its usually one or the other that goes black. Sometimes both will go black, and resumes, saying nvidia driver has stop responding... etc. I've searched for this problem and they suggested me to delete and reinstall the drivers again. Which didn't work.
Also, is it weird if only one of my gpu gets hot when I play games. I download a gpu core thing and whenever I play games, it shows only one of my gpu gets hot. I thought the sli bridge should use both the gpus.
When SLI is enabled, I thought both monitors needed to be connected to the top card. Maybe that is what's causing you issues and crashing the graphics driver. I would do what Sunius suggested and test each card alone to make sure they both function properly first. If you didn't change settings in BIOS to enable SLI, then you shouldn't need to change settings when you use only one card.