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The LG 34 Inch UltraGear™ WQHD 1440p 240Hz 1ms AMD FreeSync™ Premium Curved Gaming Monitor with USB Type-C PD 15W, Model # 34G63DA-B, has a native WQHD 3440 x 1440 resolution that is not supported on your PS5. However, the monitor does support a resolution of 2560 x 1440 @ 120 Hz (actual timing is 119.998 Hz), which is supported on your PS%, but that resolution has an Aspect Ratio of 16:9, and since the monitor has an Aspect Ratio of 21:9, you will get black bars on the screen with the 2560 x 1440 resolution...^Ivan.
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