onboard gpu in tandem with Asus gtx 1060 for two monitors?

May 15, 2018
I do video editing only,no gaming on my pc.I want to add another monitor.Setup is as follows:i7-8700k o.c. to 4800mhz/z370 Aorus gaming 7 mobo/32 gb DDR4 1333mhz(2666 in dual channel)memory/Asus GTX 1060 6 gb dual fan GPU/Thermaltake Toughpower Grand 750 watt psu/Plextor 119 gb ssd m.2/Kingston Hyper X ssd 112 gb/2 tb Western Digital hdd/2 tb Seagate Barracuda hdd/Thermaltake Water 3.0 liquid cooler.monitor one is Dell 24"using HDMI port.Monitor 2 is Vizio 20" with HDMI or VGA port.Question is do I use mobo onboard graphics to run 2nd monitor?Asus card can run two,but it only has one HDMI port.Dont want to even consider using crappy Vizio VGA port and cheap Dell monitor doesnt have a display port.Also,I have a Nvidia Quadro FX 3800 card that I could use for 2nd monitor but I dont want to use PCI E 8 slot that would cut the 16x slot to 8.Does this speed matter,especially since I'm not gaming and not concerned with fps dropping?So in summary considering monitor choices I have,use onboard gpu for second monitor or install Quadro in second PCI e slot?Is the bandwidth loss when using two different cards negligible since I'm not gaming?If this matters,Dell monitor is 1920 x 1080 at 60 hz and Vizio is I'm guessing 1280 x 720 at 60 hz?Forgive my stupidity,I seek knowledge from the Elders.