Dell UP2715K 27-inch 5K Monitor Review

Grayscale Tracking And Gamma Response

Our grayscale and gamma tests are described in detail here.

Dell's UP2715K has many calibration options and color presets so we thought it best to show you everything. There are quite a few charts ahead but it should help users decide the best way to optimize this monitor.

From the grayscale standpoint, the default Color Temp mode looks pretty good. The errors run slightly green as brightness increases but the monitor is perfectly usable this way. We don't recommend adjusting the color temp slider unless you want more blue or more red in the image.

Moving to the Adobe RGB and sRGB presets we see a visible shift to red. These are factory-calibrated modes but we think they have room for improvement. Dell claims errors under 2dE on the enclosed data sheet but our tests showed average levels around 4dE.

Next, we worked with the Custom mode, which has full control of every parameter. With no changes, it looks about the same as Color Temp, which means a slight green tint.

We only had to change the RGB gains to achieve this excellent result. This is what we'd expect of a premium professional product like this. There's nothing to complain about here.

The auto-cal software does a decent job but there is a little blue in the Adobe preset we created. It's barely visible in actual content and the improvements in gamut accuracy are well worth a little aberration in grayscale. You'll see those results on the next page.

The sRGB preset we created in the Cal 2 memory is visually perfect. All errors are below 2dE except 100 percent, which is still invisible at less than 3dE.

Here is our comparison group.

4.35dE represents the Color Temp mode. Custom, sRGB and Adobe RGB presets measure about the same. As a professional product we think the UP2715K should offer better results out of the box, especially considering that other Dell pro monitors we've tested measure better in their default states.

Using the auto-cal software returned decent results of 1.22dE for sRGB and 2.68dE for Adobe. The best possible grayscale tracking is found in the Custom mode where we achieved .95dE. That mode has a less-accurate color gamut though, and no option for sRGB. We still maintain that using auto-cal with the Cal 1 and 2 modes is the best course of action.

Gamma Response

Each image mode yielded a different gamma result. Color Temp is quite good except for the 10-percent level, which is too dark. There is a little muddiness in the deepest shadows here but depth is otherwise good.

The Adobe RGB and sRGB presets have the worst gamma tracking of all. The curve runs too dark across the board with visible clipping of detail at 90 percent where there's a significant spike.

In the Custom mode you can specify a PC (2.2) or Mac (1.8) gamma and both measure well except for the 10-percent point. Calibration has no effect on the results, which look the same both before and after.

Near-perfect gamma performance is possible using the auto-cal software. There are no issues to report in either Adobe RGB or sRGB modes.

Here is our comparison group again.

The UP2715K's comparison results are based on the aforementioned programmed (Cal 1 & 2) Adobe and sRGB modes we created. The auto-cal software creates the best possible result and puts it among the best professional screens we've tested to date. A .09 variation in values is about as close to perfect as one can get.

We calculate gamma deviation by simply expressing the difference from 2.2 as a percentage.

An average value of 2.21 is visually identical to a perfect 2.2 result. There are no gamma issues whatsoever when using the provided calibration software.

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19 comments
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  • Logen_
    On the specifications chart, it says that the panel is AMVA, but a little below the chart, it's mentioned that it's an IPS panel instead. Going by the conclusion and contrast ratio, definitely IPS. Also, 3 year warranty, that's.... so little for something that clearly deserves a 5 year or more, in my opinion.
  • ceberle
    Quote:
    On the specifications chart, it says that the panel is AMVA, but a little below the chart, it's mentioned that it's an IPS panel instead. Going by the conclusion and contrast ratio, definitely IPS. Also, 3 year warranty, that's.... so little for something that clearly deserves a 5 year or more, in my opinion.


    It is indeed AH-IPS not AMVA. Thanks for pointing out our error.

    -Christian-
  • huilun02
    Oh look its a retina display with retina pricetag
  • Jeff_53
    Why isn't the MSRP on the first or last page? My interest in the product and features is directly tied to it's price.
  • apertotes
    That contrast... ugh! For 99% of users, contrast is much more important than color fidelity.
  • theusual
    How about a test of the DELL S2716DG? Especiall vs the ASUS ROG PG279Q.
  • theusual
    Quote:
    How about a test of the DELL S2716DG? Especiall vs the ASUS ROG PG279Q.

    Never mind. That would be TN vs IPS. You could compare it to the PG278Q though.
  • CBender
    + for the price thing. It is absolutely irritating. Hope you guys fix this.
  • PellehDin
    If they fix the price issue - and the current price is about $1,500 and up - you might just skip the article, which they don't want.
  • CBender
    I don't read the review articles just because of that. I am going to read a full review for a product not that I can't afford, but a product that I consider it be way overpriced (not for this particular review)
  • TallestJon96
    I know I'm a gamer who's out of place in a professional work monitor article, but between the low response time, and you statement that you could play at 40fps, id love to see an article about gaming at 5k, particularly with titan x vs 980 ti benches
  • cats_Paw
    Well, I guess we needed higher resolution to keep "can it run crysis" alive.
  • It is cool to see they are pushing 5k and what not but it is absulutely useless for PC on 27". The only perfect resolution right now is 2K 144Hz, everything over that is waste.
  • Uri___Pisarev
    Quote:
    If they fix the price issue - and the current price is about $1,500 and up - you might just skip the article, which they don't want.



    I have a Dell U3415W, a 34 inch Ultrawide. Price on it was also $1.5K and it did not move, but during the holiday season it fell to $700.

    So if you are interested in a product don't just give up because you can't afford it, it can easily fall into your price range as long as you have reasonable expectations.
  • Uri___Pisarev
    Quote:
    It is cool to see they are pushing 5k and what not but it is absulutely useless for PC on 27". The only perfect resolution right now is 2K 144Hz, everything over that is waste.


    I had a 24 inch monitor and switched to a 32 inch TV and later to a 34 inch monitor.

    I have to say, you can never go back in size ever again. I would not even look at 27 inch.
  • mrmez
    Quote:
    It is cool to see they are pushing 5k and what not but it is absulutely useless for PC on 27". The only perfect resolution right now is 2K 144Hz, everything over that is waste.


    Maybe if you've got poor eyesight, just want to game or have a sub 25" panel.
    I switched from 1440 to 5k ~18 months ago (both 27"), and the difference is amazing.
    Remember this is a pro grade screen for pro users. What matters to them is colour range and accuracy. Refresh rate means almost nothing.
  • lip008
    At $1500 I would just buy a refurbished iMac. I know this monitor will outlast the hardware within the iMac. Others may want to run a machine that is more capable than an iMac, but it's interesting to me how an AIO can sometimes be the same price or cheaper than just the monitor. The 5k iMac maxes out at 4k running Windows the last time I checked though.
  • zodiacfml
    Something's amiss. How is it possible to achieve 100 percent Adobe RGB while just using W-LED backlighting?
  • zodiacfml
    Never mind. The capability seems pretty standard on 5K displays.

    Quote:
    Something's amiss. How is it possible to achieve 100 percent Adobe RGB while just using W-LED backlighting?