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I don't play Fortnite but can give some guidance on it's performance as a GPU as well as some general FPS guidelines. Rx580 is %1-%3 better performance than the Rx480. More power efficient and uses Radeon Chill. If a game supports Radeon Chill it will drop the frame rate to keep the card cool and pull less power to prevent overheating during idle/camping moments. The human eye can only catch 30FPS so games that run higher are "smoother" because there's more animations to make sure than you don't see sputtering and so on. Once you're hitting the 70+ FPS range the eye wont really tell too much difference unless it drops suddenly to 30-. Rx580 came out when 1440p was the gaming preference. Also depends what resolution your display can handle verses what you have the settings (low/medium/high/ultra/custom) at. All these play factors into FPS along with CPU speeds, Ram availability and temp. With all that being said I can run games like Final Fantasy 14 on the highest settings at 1366x768 (my tv resolution max) Memory Clock OC to 2000 Core Clock OC to 1400 and CPU OC by the MSI bios (game mode) to 3.8GHz and get 112-140 FPS sometimes higher. Lowest is in high traffic parts of cities and big fights. I'm pretty confident it can run Fortnite around 70FPS maxed out maybe with some dips to 40FPS when big effects like mass explosions are happening. If you would like reply to the answer and I can do a test run for you in Fortnite and let you know more game specifics. Hope this helps.
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