Test it. Prepare a photoshop document which has the same resolution as your screen, then zoom on it and prepare some block of pixels, like one black, then one white next to it then another black etc, using the pencil tool, maybe even use colors. Then zoom out and look at it at 100% and try to see if you can make out the pixels you just put there.
Done, it is rather smallish the pixel, but it is visible. Keeping in mind as I said above my 27'' is LED and rather bright (have it on the vivid setting) the 30'' is LCD and quite a bit duller, that may make it look more pixelated?