Vintorix - if your using one of the preset render settings they all have anti-aliasing set. If you want to control them you need to use User Settings.

Maybe your seeing the effect of Interpolation Type on a projected texture map (you can find this in the function editor for a texture on the Projected Texture node) - if you don't want any just set it to None.  That has been discussed here before and I wrote some Python scripts to make switching between the different modes quick when an object has a complex set of materials.  You can find the scripts on my website on the page the page Switch Mapping of Images in Vue Materials.

Hope those help you get the settings you prefer.

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