You need to reduce the intensity to 6 or lower.
Already tried that, I changed it to 4. For some reason when I start the miner it still says the intensity is 6. Guess I'll really try putting it into a different slot like br2459 said and see what happens. Thanks guys!
Change the PCIE to generation 1 in the motherboard BIOS. Reinstall the driver 15.12.
For anyone having this problem this really solved it! Went to my "rig" today and did what RastMan said to do, worked like a charm. Not only can I lower my intensity bellow 6 now. I can also run the latest miner, which gave me a boost of about 40H/s. Thanks for the help!