The article is 3D for Flight Sims by Bruce Wilson.
Bruce Wilson is a nationally known expert is computer graphics who has an interest in flight sims.  He no longer contributes flight sim articles due to professional demands.

http://www.avsim.com/fsbench/3darticle.htm

Note his discription of 3D, polygons and textures.

Here is an article tying the 3D for Flight Sims to CFS3:

http://www.mvps.org/directx/articles/vcache.htm

The article is Batching of Polygons with a Vertex Cache by Robert Dunlop, MS Direct X.

The tie is to CFS3 Config/Texture Info and the Vertex and Index Buffer Pools.  Default settings allow the graphics card to decide where the pool is to be located. D3DPOOL_SYSTEMMEM places the buffers in RAM.  The Index is in card memory.
My sliders are maxed and SYSTEMMEM.
I don't know if it makes a difference as the driver m/b programmed to utilize the efficiency of the vertex buffer and indexes.  I now know the intent of the Config settings.