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The fastest card in the market is the NVIDIA Titan (this is Pro frade). The commercial grade fastest is the NVIDIA RTX 3090. Not knowing the amount of power that your PSU provides and the baseline load that your computer uses from that PSU is impossible to know if a PSU upgrade is required. The RTX 3090 consumes between 350W to 450W (if overclocked). A Typical I7-10700 rig consumes about 150W so make your math.....
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