It is my understanding that, while the extra cores make the sim run smoother, they do not help framerates. Since the original post seemed mostly concerned about improvement to frame rates, I didn't think the activity of the other cores was significant. The replies indicated the same as you indicate. SP2 facilitates this quite well, and it is an advantage of having the Acceleration Pack installed also.There have been other posts expressing concern that their quad-core processor was not working properly because Task Manager showed heavy activity on one core and minimal activity on the others. On a Quad Core, cores 1, 2, and 3 can be maxed out at 100% while loading textures, while the first core (Core 0) is almost at idle, or a very low percentage usage. Though Halloween is still a week away, Sierrasim Simulation begins their Halloween sale today This week at the FlightSim.Com Store save 40 on most of their scenery add-ons for MSFS 2020, Prepar3D and X-Plane. When I install the acceleration pagkage the installation seems to be OK as the installer tells me the package has been succesfully installed. This weekend only sale 30 on a select group of Aerosoft scenery and aircraft for FSX and Prepar3D. Before installing the acceleration package I have tested the FSX and it worked with the default planes and settings.

You can see this very easily if you run Task Manager while FSX is loading or running, and watch the core usage. I have bought a new PC and installed the FSX without any problem, including the activation. The main FSX program (.exe) will run on the first core (Core 0), and on a quad core most of the other things like texure loading, etc will occur on the other 3 cores (Cores 1, 2, and 3). Don't know where you read that Art, but it's not true.

Fsx acceleration completo