2 Graphics Cards

Hi Everyone! My aim is to reduce the power consumption and heat production of my PC. I want to install 2 graphics cards. I have an old card and I'd like to buy a newer, better one which consumes more power and produces more heat. For non-CAD work, I'd use the old card and power off the new...

So I had a GTX 980 which I used for gaming and it died a quick and painful death. I was temporarily using a Quadro K4000 to make sure that it was just the card that died and it was working fine. I just upgraded to the 1660 Super and I'm wondering if there's any value to keeping the K4000...