Can you use 2 graphics card in one computer, but only use one at a time?

Jul 18, 2018
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I know it sounds weird, but i have my reasons...
I just got an Rx 580 8gb and was wondering if i could keep my gtx 960 installed, but since i cant sli/crossfire it, just not use it, but have the ability to switch to it whenever i want. thanks in advance
 
Solution
As everyone else has said, it's entirely possible. However, getting games to use each one properly and programs is a lot more hassle than it's worth. Not to mention, extra heat, software incompatibility for two different GPUs, etc.