Here's an interesting user video from XP11...  Same clock speed, different CPU.  He had a GTX 1080 for both systems.  I'm actually suprised the increase wasn't more.  I wonder if the monitor is 60Hz - the 8700K fps don't go much higher than that.

https://www.youtube.com/watch?v=ADQu_Ryh70A&feature=youtu.be

Here's the thread at xplane org

https://forums.x-plane.org/index.php?/forums/topic/135352-test-2600k-45-ghz-vs-8700k-45ghz-xplane-11/&

Must be 60Hz monitor...like you say Ryan

I just ran into this this afternoon. I set the FSX frame rate to unlimited while I was at FL350. I had 58-63 FPS but no higher. Not even brief blips higher. I ran Nvidia Inspector, and I found out that I had vsync set to  "force on", which I believe is 1x refresh rate. I changed it to off, saved my flight, and restarted FSX. When my flight reloaded I was getting 100-140 FPS.

I'll bet he had vsync turned on in the card. 

As a side note: Yes, the little CPU graphs in task manager kill FPS. I only got ~75 FPS with that running. 

Great video comparison!  I just ran across an article about the differences between the i7 2600K and the i7 8700K - https://www.techspot.com/review/1546-intel-2nd-gen-core-i7-vs-8th-gen/.  Came here to post it and saw this topic. The fps differences are dramatic.  I remember when the 2600K first came out and Nick Needham (NickN), a reputed expert with FSX and developer of GEX/GEP3D, authored his FSX Bible and declared the 2600K was one heck of an upgrade and the greatest thing that happened to FSX.  He was very excited and we both bought about the same systems featuring this new chipset. He declared then there was no more need for FSX tweaks.  The 2600K was simply too powerful.  I totally agreed then and I still do today.  It was a major revolutionary change to FSX and the quality of the addons we would get soon after the release.  When developers see dramatic improvements in FPS and performance, they like to add more eye-candy as the more eye-candy the more likely the sale.  And I like that idea if they have options to turn some of it off, but it makes flight simulation much more expensive as the addons are more expensive and, of course, you have to upgrade the CPU/GPU and MB to get better performance with all of this new eye-candy. 

And I remember this forum abuzz with a benchmark program that everyone could use to test the new 2600K.  It seemed to be the most popular forum on AVSIM at the time.  Everyone seem very excited indeed.

And the fasination of flight simulation continues...

10 hours ago, Jim Young said:

Great video comparison!  I just ran across an article about the differences between the i7 2600K and the i7 8700K - https://www.techspot.com/review/1546-intel-2nd-gen-core-i7-vs-8th-gen/.  Came here to post it and saw this topic. The fps differences are dramatic.  I remember when the 2600K first came out and Nick Needham (NickN), a reputed expert with FSX and developer of GEX/GEP3D, authored his FSX Bible and declared the 2600K was one heck of an upgrade and the greatest thing that happened to FSX.  He was very excited and we both bought about the same systems featuring this new chipset. He declared then there was no more need for FSX tweaks.  The 2600K was simply too powerful.  I totally agreed then and I still do today.  It was a major revolutionary change to FSX and the quality of the addons we would get soon after the release.  When developers see dramatic improvements in FPS and performance, they like to add more eye-candy as the more eye-candy the more likely the sale.  And I like that idea if they have options to turn some of it off, but it makes flight simulation much more expensive as the addons are more expensive and, of course, you have to upgrade the CPU/GPU and MB to get better performance with all of this new eye-candy. 

And I remember this forum abuzz with a benchmark program that everyone could use to test the new 2600K.  It seemed to be the most popular forum on AVSIM at the time.  Everyone seem very excited indeed.

And the fasination of flight simulation continues...

Well stated, Jim.