The PG258Q does suffer obvious vertical lines pixel inversion(aka interlace pattern artifacts). It is more pronounced at the lower refresh rate ranges(G-Sync, ULMB, fixed refresh, it doesn't matter), but is still visible at the upper range. The lines are just something you have to deal with. However, lowering the backlight brightness will reduce visibility of the lines, and the PG258Q does come insanely bright out of the box. I'm also pretty sure this effect could even be seen on a static desktop if you play with your vision or blink your eyes.
The only panels I've personally seen to not cause any pixel inversion would be the 24GM77 and XB270HU Bprz. But the pattern on those displays could just be fainter, or more of a mesh pattern so that it isn't so easily noticed.
The S2417dg, S2716dg, PG278q/PG278qr all should have vertical lines pixel inversion. The PG348Q/X34 should have horizontal lines. And Samsung Cfg70 might have a checkerboard pattern.
Edited by Neclord06 - 4/3/17 at 4:27am