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In terms of driving the displays, there's one notable difference between 30-series cards and older cards: HDMI 2.1 support. What connectors do the displays have? If the TV only has HDMI for example, then a 30 series card with HDMI 2.1 support (assuming TV supports same) could do 4k 120Hz, whereas older cards would be limited to 60 Hz.

 

I'm not up to speed on what limitations are current on DP, but similarly you'd have to check support on both ends if you want to go above 4k60.

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Not a gamer.

 

The 55" TV currently is in my family room and will be moved to my office.  I'm buying bigger 85" 8K for the family room.  The 55" 4K 120Hz HDMI will always be playing a Youtube video.  Then I have 2 LG 49" UW monitor currently in a stacked config on top of each other.  The LG bottom one is mostly used for web surfing.  The top LG display is used to monitor my security system and for Zoom video calls.

 

Would 1 Nvidia card be enough to support 1 4K 120Hz and 2X 5120*1440p displays? So that would be 3 displays in total.

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Sure one decent GPU is enough to drive the pixels.

You might want to look into a never GPU for things like Nvidia active noise cancelling and such.

I would go a RTX2000 series unless you really want to run that TV at 120hz then you want HDMI 2.1 meaning you want a 3000 series.

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