If your video card is causing blue screens, I would suggest you get a nice thermal monitor and see if yoiu can't detect any issues with abnormal heat from the card. As over heating on the video card will cause blue screens just like over heating your CPU will.
There are several nice freeware apps that do a great job of this.
SpeedFan is one that I've used for a long time, It monitors everything under the sun, fom your cpu to your hard drives.
SpeedFan - Access temperature sensor in your computer