I can smoothly edit 4K video and play it without lag in Davinci Resolve which uses both graphics cards. How do I get windows 10 to use both cards? I c

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I can smoothly edit 4K video and play it without lag in Davinci Resolve Studio 16 which uses both of my Nvidia graphics cards at around 96%. When I try to play an exported video back in Windows media player, VCL etc. windows only uses 1 of my graphics cards and always at 100%. How do I get windows 10 to use both graphics cards when playing a 4K video? I'm getting severe lag as a result making them unplayable. I know Windows can see both graphics cards since Davinci Resolve uses both. My VRAM is set to 4096mb. I also have 128 gigs of RAM which I'd also like to see windows use a lot more of. I r

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