After a while, however, the maximum achievable frequency seems to be reduced to 600MHz.
I then noticed that after a reboot, the APU can scale up the frequency to the nominal maximum, which is 1GHZ. After some time (several hours), they become noticeably sluggish and the CPU utilization suddenly seems higher. I noticed that they are really responsive and powerful after a reboot. Meanwhile I am not sure if there is not one more aspect: I have two APU2 in use (APU2C4 and APU2E4). Of course, this always depends on the individual case: What services are enabled on the firewall? Does WAN have to be connected via PPPoE? How large is the MTU? Are the correct tunables set? Etc. However, questions have been piling up here and in other forums over the past few months as to why APU-based firewall performance dips and doesn't seem to be enough for some, while it's fast enough for others in a similar context. And that's why I prefer such a cost-effective and power-saving device whenever possible. However, I can say from experience that they are more than sufficient in many cases and more performance is simply not necessary. The performance of the used SOC AMD GX412TC is certainly much lower compared to i3 or i5 systems. Accordingly, it is often used by users here in the forum. The APU2/3/4 devices are predestined for use as routers under OPNsense: Inexpensive reliable hardware with open source BIOS.
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