Thanks for the test, smt off is only good if you are sure you will play a game that benefits from it for a long time, beginning to end, around 20 hours or more. So you dont need to go all the time into bios and change it. Few games benefit, nowadays many game engines have added smt in its code to benefit from it. Few games have the inverse, their 1% lows are much deeper if smt is off. Few people on reddit are planning a list of games that benefit from having smt off.
in 2008 when hyper-threading was released, smt off was a must, it was a huge performance impact leaving it enabled on games, you had to turn it off, 5 to 25% or so. Windows and game devs have improved the use of smt a lot.
Since its release, the 9400f is still the best cost benefit modern cpu.