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It will automatically clock up under light loads, it's a feature, not a problem.
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This is normal behavior for stock settings on the R5 1700. AMD specifies base clock of 3GHz and a max boost of 3.7GHz, but with XFR enabled (it is by default) it will extend your base frequency to 3.2GHz and your boost to ~3.8GHz. (3.75GHz in your case).The XFR range is dependent on your PC configuration, its ability to provide power and keep a cool operating temperature. So at default you should see 3.2GHZ base and up to 3.8GHz at boost (light load or single core).
If you want to disable your boost and run at base clocks only (3GHz) disable core performance boost (otherwise known as XFR) in your BIOS/UEFI, normally found in AMD CBS in the BIOS(this can be labeled differently depending on motherboard manufacture).