Two X-Plane 10 systems running version 10.5. Side by side.
System 1 is i7-6700K overclocked to 4.5GHz, multithreading on, running Windows 10 anniversary edition. Graphics card GTX 980, 32GB memory. (Established system on X-Plane 10 for some time with regular updates)
System 2 is i7-6850K overclocked to 4.4GHz, multithreading off, running windows 10 anniversary edition. Graphics Card GTX 1080, 64GB memory. (Newly built system, recently installed digital download X-Plane 10)
Rendering settings set up the same, same scenario, plane, airport. Disabled plugins on first system to match the basic installed second system.
The issue is that my frame rates are 10-20 fps worse on the second system than the first. To the point of below 20fps at more times than it should compared to the same scenario on system1. This makes X-Plane and me very unhappy when flying.
The video card on system 1 (GTX 980) is running about 90% utilized. On the second system (GTX 1080) it is about 45-50%.
What is strange is that when I look at the two systems via HWMonitor, the 4 cores on the first system are pegged close to the overclocked max (4.5GHz) while running x-plane. On the second system the 6 cores vary a lot from maxed clock (4.4GHz) to 1.2GHz. One theory is that X-plane not getting enough processor time or not forcing the cores to clock up to higher frequencies consistently like the 6700K. I am at a loss as to why it would it be treated differently on the 6700K vs the 6850K. I've tried to increase the priority of X-plane 10 in task manager to high, but no positive change to X-Plane.. Any thoughts, ideas or help would be appreciated.