Hello,
today a friend of mine gave me his Gtx 980ti. I installed it correctly into my Pc with all the required setup and extras like the SLI bridge. After that i started the Pc, everything worked great the card was showing up in the Nvidia Control Panel and i enabled PhysX for both cards. Because my single 980ti was running a little hot with its overclock i removed the overclock and put them both to their stock values so i dont fry both cards while benchmarking. Directly while benchmarking with Heaven the Pc crashed (blue screen with the error SYSTEM_THREAD_EXCEPTION_NOT_HANDLED) . No problem i restarted the Computer and tried Playing a game, same thing happens (blue screen). Then i removed the Nvidia Driver and did a fresh reinstall of all Nvidia drivers. Now the second card does not show up in the Nvidia control panel anymore. If i look into the device manager it says both cards are beeing detected. The second card however has a little exclamation mark saying error code 43. My bios also shows that both cards are runnng in both slots with 8x in every PCI-E slot.
I would be happy if anyone could help me because i will not be able to figure this out on my own.