Question Why is my Vega 64 only running at 800-1000Mhz in-game?

Mar 23, 2019
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I ran the heaven benchmark on 1620 on the core and 1100 on the memory and in overwatch I was able to get the same speeds but in fortnite, in the lobby i get 1500-1600Mhz on the core but in an actual game i get 800-1000 with 45-70% util and temp never goes above 54C. Anyone have the same issue or know of a fix? Thanks!
 

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