30 MACWORLD MARCH 2020
MACUSER REVIEW: SAMSUNG CJ791 ULTRA WIDE QLED DISPLAYthat you likely won’t care. Put another way,
it’s not quite Retina—you can see the
pixels if you sit too close, but it didn’t take
long to get over that and appreciate the
extra width.
The 21:9 ratio resolution is also known
as Ultra Wide Quad High Definition
(UWQHD), or the wide brother of the 2560
by 1440 QHD that was at the top of the HD
food chain for several years before 4K
UHD (3840 by 2160), 4K (4098 by 2160),
and Apple’s 16:9 4K (4098 by 2304)
showed up. Now you also have Apple’s 5K
display on the iMac (16:9; 5120 by 2880)
and upcoming 6K Pro Display XDR (16:9;
6016 by 3384—if you have a 5K iMac or
plan to get the Pro Display XDR, you’re not
really in the market for a CJ791. If you’re
using a MacBook or Mac mini, then it’s a
worthy option.
The CJ791 is a
10-bit panel which
means it’s
theoretically
capable of just over
a billion colors, and
is touted as
covering 125
percent of sRGB.
That’s a very good
color gamut
compared to most
displays, but there
are a lot of color
spaces, and sRGB is hardly the widest.
There are others that encompass more of
the total visible spectrum such as Adobe
RGB, DCI-P3, bt.2020, etc. The display
does use quantum dots so its color is far
more accurate than the typical LED-backlit
LCD computer monitor.
The CJ791 is rated for 300 nits
brightness, which is quite a bit lower than
most Apple displays, but it offers a decent
4 millisecond response time with support
for FreeSync gaming. With FreeSync, the
display will match its refresh rate to the
frame rates being delivered to it by the
GPU. This can reduce lag and eliminates
screen tearing, where the display starts
rendering a new frame before it’s finished
with the old one. The only requirement is
that you limit your game to 100 frames perThanks to a wide selection of ports, the CJ791 will function nicely as a
laptop docking station.