Hello!
I have been experiencing the same screen flicker for some time now. Recently, I looked into what might be causing it, but I couldn't conclude on anything. There were some anomalies with the GPU's clock while the flickering was happening, so there might be a connection there, but I am not competent enough myself to make that connection.
This behavior manifests itself either when the system is first started (or awakened from sleep/hibernation) and sometimes when I launch a game, there's a screenshot to reflect both. If I have a second monitor connect, sometimes the visual flicker happens on the other screen (
Note: It's always on only one or the other, never both). I have included below some screenshots of Afterburner open showing the aforementioned behavior, a video of the flicker in question and an Afterburner history log file, in case that is helpful.
To give some info on the system, I am running a 64 bit Windows 10 on a G75VW, installed on a 250GB Samsung 840 EVO SSD *Samsung Magician is installed* and using the stock HDD (ST750LX003-1AC154) as a media drive. Should be a default setup, but just in case; the GPU is a GTX 670 (3GB VRAM), CPU is a i7-3610QM chip @ 2.3 (before turbo boost) and 16GB of RAM. I rarely overclock the GPU and if I do, it's in line with some of the guides I've read here, max of 700MHz Core Clock and 1750MHz Mem Clock.
Screenshots: 
[This was just after a fresh system start, notice the graph.]

[In this instance, I've started a game, the clock speed behaves the same and it directly affects the game's FPS (notice FPS graph in top right, next to mini-map)
Video :https://onedrive.live.com/redir?resid=E92427691C39599C!38786&authkey=!AGzbgomjhUM2rr0&ithint=video%2...Thank you for your time and I hope someone has ran into this before and can advise me as to how to handle it.
~Danny
EDIT: Forgot to mention drives.