http://www.lagom.nl/lcd-test/black.php
(also contains other monitor tests)
I appear not to notice anything on my Macbook Pro display, although that could be caused by
a) Me not knowing what to look for
b) My vision being too poor to notice
c) This display does not use temporal dithering
I'm thinking it's c) as I used to use a ASUS VE278Q monitor above 90% brightness to avoid PWM (vision got worse due to high brightness) and I know from the manual it uses a 6-bit TN panel and FRC (Temporal Dithering) and could see the "snow effect' almost always at Windows desktop using certain backgrounds. Never seemed to bother me though.
I'd be interested in hearing what others think, and most importantly if anyone has caputred the snow artifact on camera, or whatnot
JTL