Interesting GPU/CPU Usage

[EZ1]

I was just running the London free flight to watch my GPU and CPU usage to see how lots of buildings affect them. I dropped down to around 2000 feet and started following the river from the Tower Bridge Eastward to the sea. While over central London the GPU usage fluctuated between 70% and 80% which I thought was pretty low considering the buildings. I have “Unlimited Building” configured. The CPU usage was distributed fairly evenly over 4 cores running around 50% to 60% on each. The CPU usage stayed consistent for the rest of my flight. However, as I left London and got into the country side the GPU usage maxed out and stayed there until I quit the mission. That is exactly opposite of what I expected. Also, as I posted before, when the GPU maxes out I start seeing usage on the second GPU (not running SLI).

As for I/O I was just watching the HD access light which only blinked once or twice a second throughout the flight. If there was a lot of I/O going on it was happening mostly in the RAID cache.

Anyone have an explanation?