REVIEW: Dell U2713H Part 14
We measured the U2713H at its native resolution while running it at 60 Hz via a dual link DVI connection. Before measuring, we reverted the monitor back to its factory presets.
We determined response times for black-white transitions as well as the fastest gray to gray transition. Additionally we also note the average value for our 15 different measurement points.
In its data sheet Dell specifies a 6 ms response time (GtG). The U2713H does not include an Overdrive option.An attempt at the display modes Standard, Games, or Movie also showed no difference in response time.
We select the preconfigured mode Standard and measure 9.6 ms for black white as well as 7.6 ms for the fastest gray to gray transition The overall response time (from-to and back) that we averaged across our 15 measurements is only slightly longer at 11.8 ms.
Short response times for IPS, brightness curve with heavy overshoot.
There is no way that response times this short could be achieved on an IPS panel without using strong overdrive. And indeed we were able to detect pronounced, if not heavy, overshoot on all measurement points. When watching videos for example, response times don't need to be this short and, on the contrary, increase the risk of unwanted image artifacts. So this feature is primarily aimed at fans of fast paced gaming.
Visible overdrive artifacts.
Latency is an important indicator for gamers, which we establish as the sum of the signal delay time and half of the averaged response time. After these overdrive results we naturally expected to see the extremely short signal delay time known from many other Dell monitors, but surprisingly the opposite was the case: at 30.0 ms we found the signal delay time of the U2713H to be extremely long. Another 5.9 ms pass until the target brightness is reached, resulting in a --for hardcore gamers disappointingly slow-- 35.9 ms averaged total latency.
Our measured brightness curve attests to the fact that the backlight is continuously lit when set to full brightness (100 %, red curve in chart). Turned down to 140 cd/sqm in our working environment (yellow curve), the curve evenly scales downwards, showing no pulsing that would be indicative of PWM. This continuous control goes on all the way down to the lowest setting (0 %, purple curve).
The brightness curve of the continuously lit backlight reveals overlapping oscillations.
The brightness curve shows a few peculiarities however. First of all, across the entire brightness setting range we notice an overlapping oscillation of 1,000 Hz with low amplitude. Between the 20 and the 50 setting an additional and stronger oscillation of 11,250 Hz emerges, which is visible in the chart as a saw toothed curve (yellow curve, 22 % setting). We are not clear on the purpose of this. But since both frequencies are very high and imperceptible to the eye, this monitor can be safely regarded as free of any backlight flickering.
As far as gaming is concerned the DELL U2713H makes a good but not extraordinary impression. The sRGB mode prevents annoying and unrealistically gaudy colors. Since the corresponding tone value curve is reproduced too, detailed depth depictions remain flawless. The aggressive overdrive implementation reduces the image quality for moving content, particularly in scenes with strong contrast differences. Depending on game and gamer, the latency can be somewhat too long, In our PixPerAn readability test, we reach level 9.
Picture from "Battlefield 3" at 2560 x 1440 resolution.
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