I was re-processing the big project and saw some interesting numbers.
It makes a point cloud as part of the process to figure out the 3D shape of the ground. Each point is colored so it looks like a photo when zoomed out. There are 561,961,960 points in the cloud. As it was finishing the cloud and RGB color of each point, it was using some ram.
It was using 130 Gig of RAM at the highest point I saw it. It was back down to 120 when I did this print screen.
The video cards (I have two) in the system just poke along at a max of 30% usage on just one card. I have more video card power than I need. I should have spent that budget on CPU power.
I reprocessed the project when I noticed a few of the targets had over two pixel error in the Z axis. Those little really hard to see triangles are hard to figure out what corner is the proper corner. Just the math of all the other points tells me I should pick the other corner on three of the 45 different targets. I moved my selection point and the error in the quality report was super tight. Plus of minus one pixel, which is 2.2 inches over 21 square miles.