GPU, the game itself & monitor ports/cable are three main things that can affect the maximum refresh rate & resolution when playing a game.
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Gigabyte AORUS FO32U2 QD-OLED gaming monitor is ready for market launch
Viotek GNV34DBE2 34-Inch UWQHD 144Hz Multimedia Gaming Monitor, Ultrawide 21:9 3440x1440p, Low Lag 1ms MPRT, FreeSync & G-Sync-Ready, HDR, 4000:1, 2X DP 2X HDMI 1x Audio Out (VESA) : Electronics
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Viotek: Gaming Monitors
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VIOTEK 24 165Hz Gaming Monitor Super Thin Build 1920x1080p FHD FreeSync G-SYNC