Pick resolution and refresh rate to see which GPUs fit.
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Pick your monitor's resolution and refresh rate to see the weakest graphics card that can reach that frame rate in light competitive games and in heavy AAA games.
Competitive games like Valorant need much less power than heavy AAA games, so the card you need depends on what you play.
Not strictly, but reaching it makes the screen look smoother. Adaptive sync such as G-Sync or FreeSync helps when FPS is lower.