World of Warcraft - Stuttering Issues and FPS drops

Firstly, WoW is a CPU heavy game most of the time, not a GPU heavy game, so you could literally have a 750 Ti and get similar performance with that CPU. Hell, I have a 1080 and a 6700K overclocked to 4.6GHz and I can't push 80 fps in the middle of populated city on Ultra, AA off, and environment sliders at 7, I can't get over 60 in the Nighthold on some fights. I do run at 3440 x 1440p though.

Secondly, your 8-core CPU is useless, since even the 64-bit client barely uses a quad-core. If you monitored the game across all cores you would find that one core is being used to the full extent, 3 are barely being used, and the other 4 are only being used by the system in the background.

Some settings you could try are to firstly scale back the render scale from 200% to 100% assuming it's not already there. Set the graphics slider to 7 as there is barely any noticeable difference from 10 to 7.
Turn off all AA, no CPU on earth can handle WoW with full AA on Ultra past 40fps and you can't really see any difference.. Turn view distance way down. Run in Windowed (Fullscreen) mode, WoW has issues running in fullscreen. Turn down Character details to ease the load on the CPU.


Now... Assuming that's not the cause of the problem, I had a similar issue which it turned out to be the refresh rate of my monitor and/or G-sync.

I have an Acer Predator X34, I had to set the Nvidia Control Panel settings to use the games refresh rate. I was also using V-sync in the game in addition to having G-sync on, I then had to change that so that V-sync is off in game, G-sync is on, and V-sync is on via the NCP. Again, for WoW I had to change the NCP settings to use the software's settings for the refresh rate.

After that I had no stuttering issues.

It was literally the strangest problem as the stuttering was worse as the CPU usage increased, and it actually locked up my system and required a hard reset. But either way that solved it. So if you have a G-sync monitor or even a 144Hz monitor that's worth a shot, assuming the graphics settings aren't your issue.