Mining with both AMD and Nvidia cards at the same time is difficult and not all mining software’s support that. In your case you can use NBMiner and or not use the Nicehash software at all.
There are also Mainboards who don’t support the mining with AMD and Nvidia simultaneously. (I’m not sure about your ASUS, but it should be explained in the manual, whether or not it does it.
Regarding BIOS, you have to enable 4GB mining for the PCIe setting.
use Nicehash (not the Quick Miner) and select NBMiner. Disable the other miners, so they don’t do the profit switching.
- use NBMiner directly (download here : Mining software supported by Awesome Miner )
- extract it into a separate folder and create a RUN.bat to start the miner
- edit the RUN.bat and include the following lines
nbminer -a ethash -o stratum+tcp://daggerhashimoto.usa.nicehash.com:3353 -u Your_Nicehash_BTC_ Address.WorkerName -p x
Let me know if you need further help.