Jagged/Black edges [artifacts] when modeling

Hi Blenderartists!
I posted a kinda similar thread before, but this time the things go worse…
I started modeling a REALLY basic shape (see the attached blend file), when I ran into a problem again: in most cases my edges are jagged and have some black holes. Very good to see in rendered view. I got the advice to turn off subdiv and don´t model in too much detail, so I scaled the model UP (didn´t help) and turned the modifier off (didn´t help either).
You can try it: Open the file, you can turn on/off subdiv modifier, auto smooth, clear the sharp edges/seams, shade smooth/flat, won´t help at all.
I´m done with this for I really don´t know WHY this occurs. Any help? Please? :frowning:

Screenshots:

a) Subdiv and Auto Smooth OFF


b) Shaded Flat and zoomed in to get a better look of the artifact


Thanks all of you beforehand
NGCHunter2

Attached file: _jaggededge_blenderartists.blend (7.3 MB)

I dont have the problem… i have just take a quick look but i dont see anything wrong with your meshes… ( no double, no faces concurrent )

I can be wrong but think it is more a problem with your system or settings on gpu / Blender system. ( could be a conflict between the gpu driver setting or just the setting parameter on Blender you are using.