Hello, I have encountered that error in device manager under my video card Gigabyte R9 270X WFOC. I just recently ordered new PC and the card was running fine for first days. As few days passed by pc started to freez at random. After rebooting pc usualy starts with integrated video and manager says windows has stopped this device (Code 43).
Freezes occur at random, sometimes few hours after booting (during watching movies/browsing net/games etc), sometimes during booting windows the other time system stops video card before booting windows.
Could it be motherboard-videocard problem since it is not Windows that stops device (sometimes it boots from integral card)?
I changed video drivers from 13.1 to these that I got on CD, I also downloaded some older ones from web. I updated motherboard BIOS to the newest. Before errors I tested card with 3DMark and everything seemed fine.
3DMark from 3.11.2013 http://www.3dmark.com/3dm11/7424306
-CPU Intel i5-4440
-Goodram 8GB 1600mhz dimm10 (1x)
-HDD WD10EZEX 1TB