@georgo85 I read that with some devices, such as yours, there might be a power draw limit in the EC (Embedded Controller) on the motherboard. Not much you can do about it. With my Teclast F15, I got best results by unlocking the power limit to 12W max. If I go 15W, there is thermal throttling, because I haven’t done any thermal modding yet. You can browse my Gekkbench results here: https://browser.geekbench.com/user/Azylisk
From what I’ve seen, for the Teclast F15 device the are actually 2 revisions: K3D5, such as mine, and the K3D8. From browsing the Geekbench results, it seems that the K3D8 revision might be slighty better than the K3D5 one.