[PeterR]

It is possible that RF interference is involved – the buzzing becomes louder when moving the CPU load higher.

How would you do “RF management”?

[PeterR]

Mine buzzes as well below 40% brightness.
As “FV” explained above it (most probably) is due to low frequency PWM (Wikipedia on PWM) used to adjust the brightness.

[PeterR]

Discovered the same option last week. Here are my results:

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CrystalDiskMark 5.2.1 x64 (C) 2007-2017 hiyohiyo
Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

Sequential Read (Q= 32,T= 1) : 95.529 MB/s
Sequential Write (Q= 32,T= 1) : 34.286 MB/s
Random Read 4KiB (Q= 32,T= 1) : 8.937 MB/s [ 2181.9 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 2.801 MB/s [ 683.8 IOPS]
Sequential Read (T= 1) : 134.850 MB/s
Sequential Write (T= 1) : 60.400 MB/s
Random Read 4KiB (Q= 1,T= 1) : 5.275 MB/s [ 1287.8 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 2.367 MB/s [ 577.9 IOPS]

Test : 1024 MiB [C: 17.6% (10.0/56.9 GiB)] (x5) [Interval=5 sec]
Date : 2017/07/20 0:21:45
OS : Windows 10 [10.0 Build 15063] (x64)
Jumper EZBOOK 3 PRO v3 – eMMC Speed HS400

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