I literally have both the Samsung S34E790C and Dell U3415W in my house at this moment. I have compared them side-by-side multiple times and I'm flat out shocked at the reviews others are giving this monitor. I have had both monitors for a week and had time to use both of them for 3+ days each and have done literal side-by-side comparisons using the same source. I have calibrated both monitors, run static image tests, gaming tests, brightness, contrast, sharpness over and over and I completely don't understand the reviews this monitor is getting. I'm guessing people just plug in the monitor and assume it's good to go without any calibration at all. Come on people. For me the Samsung was the clear winner. The Dell seemed like a far inferior monitor compared side-by-side. (Now just as a general disclaimer I am not a Samsung fanboy. I am a TECHNOLOGY fanboy. I go with whatever is the best technology at the time. I could really care less who the manufacturer is. If it's better I want it.) The Dell seems to have a refresh rate that was noticeable. It gave me a slight headache using the monitor for several days and the text also appeared blurry to me at times. I actually noticed this on the Dell the second I first turned it on. There are definitely some colors that the Dell does better but I felt there are also others the Samsung does better. Gaming, it was not even close. The Samsung is crisp and very responsive. Both monitors were set at their highest available response settings for the gaming test. Toggling the DPI on my Logitech to a very high setting and then moving the mouse back and forth very quickly you can't really perceive anything noticeable on the Samsung just crisp, responsive movement. For the Dell it struggles to respond fast enough to very fast action. The game I used for testing was Metro 2033 with 3440 x 1440 resolution. The Dell's very noticeable IPS glow was very distracting during dark scenes and as mentioned was sluggishly slow during fast action scenes. The Dell's adjustment interface and speakers are both better than the Samsung but after the monitor is calibrated I rarely use the adjustment interface on the monitor and I use headphones not monitor speakers so I'd never use that as a knock against the Samsung. For me as a gamer, productivity user and non designer the Samsung blows the Dell away.
I've uploaded 5 test images images - 2 side-by-side black and 2 side-by-side static color images for comparison and 1 image closeup of the lower right side of the Samsung.
Here are the links:
samsung black
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http://oi60.tinypic.com/72aww8.jpg
dell black
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http://oi57.tinypic.com/6egrnq.jpg
samsung color
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http://oi58.tinypic.com/jg7915.jpg
dell color
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http://oi60.tinypic.com/25koh3c.jpg
lower right side on samsung (unfortunately for this image I only have the Samsung as the Dell is all packaged up and ready to ship back - but look at how gorgeous the color is on the Samsung here, again, yes, it got washed out a bit on upload and during compression but that is how that water should look if you've ever seen anything like that in person)
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http://oi59.tinypic.com/2ey9a3m.jpg
For the black images let your eyes adjust and view in a dark room. The bad IPS glow will become apparent on the Dell after you let your eyes adjust. For the static color images, unfortunately after the images were compressed down after upload a lot of color and definition seems to have been lost but if you look down in the bottom right of the photo where the boat is on top of the lighter colored water. Having traveled to many places with water like this so I know exactly how it's supposed to look the Samsung's representation of that lighter colored blue/green is much more accurate than the Dell's. (image is included above) The noticeable differences I will point you to are on the mountain in the back middle/right, (The Samsung appears to be more brown/reddish), the trees and grass on the mountain on the left just up from center (the Dell is more green), the water in the lower right (the Samsung is more turquoise, the Dell is greener).
And for the record I calibrated both monitors with a spyder4pro before doing my comparisons. I didn't push a few buttons, "oh, the color looks bad" then send the monitor back and blame the product. Why do I have a spyder4pro if I'm not a designer? I borrowed one from a friend who is a designer and I liked it so much I ordered one for myself.
The Dell does come looking a lot better from the factory than the Samsung. The factory color setting of the Samsung does require some major adjustments. But it's irresponsible to not do any work to calibrate the monitor then blame the product as being bad.
The graphics card(s) I am using to test these images - Gigabyte G1 GTX 970 x 2 (SLI). (yes, absolutely monstrous, 100 FPS is not uncommon on some games)
1 star off for price because it's not cheap.