I have a 1700 non-X as well running about the same speed. My voltage SAYS it is about 1.352 or less using HWInfo, but measuring at the little text points by the power connector it's actually just over 1.4 volts. My BIOS lies, lol.
Highly recommend anyone buying a cheap multimeter who doesn't have one and verifying that voltage. I was scared by how high my voltage was when I THOUGHT I was running a max of 1.417 -- it was closer to 1.46 when measured with a meter! No fun. I've downclocked to 3800 again as that is where mine hits a "wall" where excessive voltage is needed just to get 50 mhz more and way too much to hit 3900.
Anyway, if you have installed aftermarket mouse or keyboard drivers some of those don't play nice with delays induced by high activity. My grandson has a "Steel Series" keyboard and mouse from ThermalTake and those drivers get weird on his Intel i7 based system even when running the little stress test in CPU-Z.
For whatever reason I'm not having that problem you mentioned or at least to the degree you are. I've actually watched YouTube videos during stress testing and they ran with occasional glitches here and there but they ran.
I don't think it's voltage related but maybe someone knows different (and can explain how that can be).
Tired of trolls and mods that act like this platform has no problems and it's the users fault. Later.