Here's the TGD, though it has two textures not included here (of course), as well as the one object texture file since it is 3500x3500. I used a displacement file of 3500X3500 created using a Nvidia plugin for Photoshop. The TER file (not included) for the loaded Heightfield can be found here -
http://www.joshushund.com/frames.html -- Scroll down to get the TER file
koyaanisqatsi.
If you have another way I can get the texture file to you, let me know. It's about a $25 object soon to appear on DAZ.
I tested this without GI in various stages from maximum to all the partial combinations in between on the way to almost zero and never going above 2 for the GI. I tried lowering all of the render settings to no avail. The only setting that made a difference was the Ray Traced Shadows.