How many GPUs can I run on Windows?

The basic support for graphics is optimized for either one or two. Anything above that will use the same support as two GPUs, which will be slightly suboptimal, but will work and you will be able to use as many GPUs as you can connect (that is, as many as the hardware supports).

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Can I have two different GPUs in my PC?

As long as you have two slots to take the cards, you can install two video cards. If you want to do SLI/Crossfire, then they'll need to be a matching pair (at least the same model, not necessarily the same manufacturer) and have the connectors to do this. Then, how do i make sure apex is using my gpu?

Does cyberpunk use PhysX?

Since Cyberpunk 2077 will be running on REDengine 3 I assume Cyberpunk 2077 will be running on DirectX 11 and use Nvidia's PhysX physics engine which runs on both DirectX 11 and OpenGL. Correspondingly, does gta 5 use physx? To answer your question: No, GTA 5 doesn't use PhysX.

Accordingly, what is the best processor for physx?

Go with the GT220. PhysX is optimized to run on nvidia GPUs. Consequently, is nvidia hd audio better than realtek? In my 35 years of experience in these matters, Realtek HD is more - forgiving. While NVIDIA H D A may have a slightly better quality, it is very finicky as to what speakers one uses. Example-NVIDIA HD has been known, (ask some of my clients) to report an actual surround sound set up as just a "Stereo" set up.