IMHO its a power supply/current issue.
However, from the BFG-Tech Support FAQ:
Q. My display becomes distorted after installing my new BFG card, why?
A. A graphics card has a power connector, please make sure a power cable from you system power supply is plugged into it. A power supply not meeting the minimum requirements can also cause this. Please check the packaging or the product page at
www.bfgtech.com <http://www.bfgtech.com/> for power supply requirements for your card.
Q. I am setting up my SLI system, should I put both BFG SLI ready cards in at once or one at a time?
A. You should check with the documentation that came with your motherboard to be certain. We suggest installing the top (closest to CPU) card first then the OS and drivers. Once the system is up and stable shut it down and switch the SLI/Single mode selector card (refer to system manual) to SLI or Dual. Insert the second card and the SLI connector across the top of the two cards. Boot the system and go into the bios to check for any SLI settings, make sure they are set to auto or SLI. After the systems boots the second card will be detected and the drivers installed and the system will need to be rebooted. Once windows loads you will see an “SLI capable system” message. Click on this message and select the “Enable SLI multi-GPU” checkbox, then “Apply” and “ok”. The system will reboot and you will see an “SLI has been enable” message. Enjoy!
Q. What is causing vertical lines and/or pixellation?
A. Please visit or check with your motherboard manufacturer for the latest BIOS and chipset drivers. If this does not fix the problem contact BFG Tech Support @ 1-866-234-3499
Hope this helps! :thumbup: