If it is stable enough that is good.
I enable C-states and speed-shift and disable speed-step as of late. If I want to disable any effect of these power savings C-states, I change my windows power plan to ultimate-performance (available in the upcoming spring release of windows 10). But really, with speed-shift enable , which can react more quickly to load changes than speed-step since it is hardware based, I really don't feel any impact from the C-states. You could try this.
I run my 3200 CL14 2x16 GB Trident-Z RGB at 3700 MHz, 1.355v 16-16-38. A little better than the stock. My CPU certainly isn't stellar but completely AVX stable @ AVX=0, 4.9 GHz, 1.344v.
PS: I use adaptive mode LLC 6 One thing to note is Asus seems to set core CPU PLL voltage pretty high. I have mine set to 1.1v (in the teakers paradise menu)
ROG Hero XIII | 10900k @5.2 GHz | g.skill 2x32GB 4200 CL18 | ROG Strix 2070S | EK Nucleus 360 Dark | 6TB SSD/nvme, 16TB external HDD | 2x 1440p | Vanatoo speakers with Klipsch sub | Fractal Meshify 2 case