On-board & Graphic card compatibility
LeatherGryphon
Posts: 12,185
I just installed a new MSI "Ventus XS" (GeForce GTX 1660), 6GB, OC graphics card into my new Asus B360M-A motherboard with an Intel i5-8600 CPU and with 32GB of RAM. Not a super machine by any means, but far better than I've ever had before. Quite happy with the new GeForce card. But I also noticed that my original graphics outlet (at least the DVI one) is still active. Should I disable the old on-board graphics? Or can they play nicely with my new card?
The new GeForce 1660 has four outputs (3 DataPort, 1 HDMI). The motherboard has three graphic outputs (HDMI, DVI, VGA) I found that I was able to run the HDMI and a DP from the 1660, and also the DVI from the motherboard, as copies of each other to three separate monitors. Is this about all I can expect or are the two graphic systems interfering with each other somehow? Is this harmful or speed limiting?
The alternative is to get a DP to DVI adapter or cable to run the 3rd monitor directly from the 1660 card, which is probably the better solution. But I'm still curious about the compatability of the two graphics systems. Most other systems I've worked with would automatically disable the on-board graphics when a graphics card was inserted into motherboard slot.

Comments
Last time I did that was on an AMD motherboard (Phenom II era) and a GTX 460. It worked fine then, so I don't see why it wouldn't now. If a GPU maker did purposely cause driver problems when their product detected a competitor's product, that would be a pretty good class action lawsuit.
They should not be interfering. The integrated graphics will perform noticeably worse than the output from the graphics card.
Thanks for all the information. Yeah, I figured it was OK, but being an old timer I don't always understand how modern electronics behave. In the old days we would have had to dig out schematics and physically move jumpers or make a couple new wirewraps after reading 5 pages of update notes.
More than once I've had to dig an in-line chip out of its soldered socket, flip it on its back like a dead bug, glue it to the circuit board, and wirewrap, new connections to its legs. Great fun. Miss it.
Hmmm, sounds like the old geforce to quadro hack (pulling and reorienting a resitor). Sometimes I miss the good old days, but not too often.