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Hi Jay - Motion Xcelerator 144Hz (sometimes called Motion Xcelerator Turbo+) on the QN90D TV provides enhanced gameplay and content with ultra-smooth motion and virtually no lag or blur, with faster response and rendering so your button-mashing gets better results with visuals that stay crisp, no matter how much action is on-screen. You’ll also gain HDMI 2.1 to further eliminate lag and motion blur with 120Hz (up to 144Hz for compatible PC-connected content). ~ Samsung Specialist
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