Or from my perspective, why not? Up until this thread, I didn't realize that using both integrated and discrete graphics could be an issue. In the absence of any conflicts/issues, using both is the easiest/cheapest way to use multiple monitors. I was using IB's TWS that way without any obvious problems (2 monitors on integrated, 3 monitors on discrete).
The AMD card I have can support 6 monitors using either a MST hub, MST/daisy chainable monitors, or both (only has 1 DisplayPort). As of right now, I've got 5 monitors all on the AMD card. Integrated graphics has been turned off in the BIOS.
In general, integrated graphic chip gives you inferior quality.
also daisy chaining gives you inferior quality.
You should connect one monitor to one graphic card port.
I guess your AMD R9 270 card has 3 ports.
your graphic card is probably about 6 years old.
Now AMD has series like Radeon RX ....
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