Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Dell P2715Q and P2415Q 4K IPS Displays

Has anyone adjusted the gamma of these Dell displays using the Mac OS X calibration tool? Test patterns would seem to indicate that the default gamma on these displays is a bit low (washed out - like around gamma 1.5 or something) and that tweaking it a bit can provide better mid-tone contrast and saturation.

I never considered this before as the monitor came factory calibrated. But nearly any gamma chart I downloaded indicated the gamma was off.

Ps. If you google gamma charts, don't view them in your browser, download them and open them in Preview. I noticed that Safari can misrepresent Gamma.
 
I'm torn between P2415Q [at 1920x1080 retina] vs. P2715Q [at 2560x1440 scaled-retina]. Has anyone gone from 24'' to 27'' (or the other way)? I already find 15'' rMBP [at 1680x1050 scaled-retina] best compromise between text-clarity and real-estate, since the menu bar [at 1440x900 retina] is just way too big. Did you have similar doubts?

ra004e's post on page 8 from the 24'' perspective was quite helpful. But couldn't find anything like it from a 27'' perspective. Also, is Dell planning to offer these two monitors with smaller bezels, like U2414H?

psymac said:
Get two Dells, I did and can't believe the quality and ease of use, well worth it. And get a competitive price quote by phone thru a chat rep, that got me both for under $1000, shipped and including tax.
Click to expand...
Also, a long shot but has anyone from Europe managed to get a similar deal? In Europe, one P2715Q seems to cost at least $680, without shipping. I'm quite envious how relatively affordable Dell is in US.
 
Last edited:
  • Like
Reactions: inkyoto
VirtualRain said:
Has anyone adjusted the gamma of these Dell displays using the Mac OS X calibration tool? Test patterns would seem to indicate that the default gamma on these displays is a bit low (washed out - like around gamma 1.5 or something) and that tweaking it a bit can provide better mid-tone contrast and saturation.

I never considered this before as the monitor came factory calibrated. But nearly any gamma chart I downloaded indicated the gamma was off.

Ps. If you google gamma charts, don't view them in your browser, download them and open them in Preview. I noticed that Safari can misrepresent Gamma.
Click to expand...

I didn't manually adjust the Gamma using this tool, but I did use a monitor calibrator on my dual 27 setup. The monitors come default set pretty warm, and was blown away at how off they were color wise until corrected.

Regarding the gamma charts and Safari. Safari supports viewing images using their embedded color profile, that's why some charts look funny. The real moral of the story here is don't trust any gamma chart that has a color profile embedded in it....it should have no color profile associated with it.
 
Last edited:
Why would one go with the 24 instead of the 27? What is the benefit, besides the lower price?

I would probably run either monitor at HiDPI 1440, if that matters, and I am mainly using the monitor to read and write code.
 
cmm said:
Why would one go with the 24 instead of the 27? What is the benefit, besides the lower price?

I would probably run either monitor at HiDPI 1440, if that matters, and I am mainly using the monitor to read and write code.
Click to expand...

The 24" has slightly higher dpi if that matters. I think HiDPI 1440 on a 24" gives text too small for most people (and there's a performace hit).
 
bobbie424242 said:
The 24" has slightly higher dpi if that matters. I think HiDPI 1440 on a 24" gives text too small for most people (and there's a performace hit).
Click to expand...
Thanks. How much of a performance hit? Is it only visible when using things like mission control or all the time? Is there the same performance hit with the 27 at HiDPI 1440?
 
normally i run everything super pixel perfect especially on my rMBP, even when hidpi options "look" good.
With the 27 4k dell i like the 1440 hidpi more than the "best for retina" which is of course crisper. The hdpi options really shines on this 27 4k, looks really good. No comparison to my 1440p iMac 27.
 
ataq said:
Just got my P2715Q. Amazing Panel, but very ugly design compared to the U2515H which i bought just a week before.
Best bang for buck U2515H, just amazing display. If you want retina quality, there is only one way.. :)

btw, I'm sending the U2515H back and will keep the 4k display. I'm running a late 2013 mbp with "just" iris pro.
Click to expand...

Hi. Did you notice a major difference in picture quality between U2515H and P2715Q?

I returned my second P2415Q recently and I'm offered either a replacement or a refund. I'm pretty frustrated with the P2415Q (sleep/wake issues, and dead pixel in my case) and was thinking of getting either 27" U2715H or 25" U2515H, both of which are 2K. I loved the quality of 4K and wondering if there's gonna be a big difference compared to 2K...

I would appreciate any suggestions.
 
I know these questions may be dumb.

Im interested in Dell P2415Q.
1)It really does not have boot screen when used in SST mode? Or was there any update to monitor or Mac Pro with which I possibly will use it.
2)Will it have 60Hz refresh rate If I will put it into MST mode.
3)And If I will do this, will I see boot screen?

Thank you for answers.
 
Anyone with a Macbook 13" 2015 may test if the P2415Q @ 60hz is possible in portrait mode?

I read that if you set Display Settings -> DisplayPort 1.2 to Enable, then you lose the option for 90 degree rotation (i.e.. portrait mode) in the OS X System Preferences.

Is it true that it do only 30hz in portrait mode?
 
Last edited:
koyoot said:
I know these questions may be dumb.

Im interested in Dell P2415Q.
1)It really does not have boot screen when used in SST mode? Or was there any update to monitor or Mac Pro with which I possibly will use it.
2)Will it have 60Hz refresh rate If I will put it into MST mode.
3)And If I will do this, will I see boot screen?

Thank you for answers.
Click to expand...

The lack of boot screens is an issue with Apple's EFI firmware... Mac's can't drive a 4K display until the OS X drivers load. Until they offer a firmware update, no 4K display will provide a boot screen on a Mac.

These displays are SST and support 4K at 60Hz with a DP1.2 connection. They don't support MST (as far as I know - and if they do, you certainly wouldn't want to use it if at all possible). MST is yester-year technology that was invented to allow DP1.1 equipped GPUs to drive a 4K display by splitting it into two smaller resolution screens.
 
koyoot said:
I know these questions may be dumb.

Im interested in Dell P2415Q.
1)It really does not have boot screen when used in SST mode? Or was there any update to monitor or Mac Pro with which I possibly will use it.
2)Will it have 60Hz refresh rate If I will put it into MST mode.
3)And If I will do this, will I see boot screen?

Thank you for answers.
Click to expand...

1. Only flashed Nvidia Maxwell video cards will give you boot screens when using DisplayPort or Mini DisplayPort. All other video cards will not display anything until OS X is fully loaded when using DisplayPort or Mini DisplayPort. HDMI will give boot screen. (This is true on Mac Pros 3,1-5,1. I have not tested this on any other model Macs)
2. I never tested MST. But, as VirtualRain stated, given a choice between MST and SST, you want to use SST.
3. If you need a boot screen, connect the monitor using HDMI.
A. Boot with HDMI connected. This will only give 30Hz but you will get boot screen.
B. Once operating system is loaded, plug in DisplayPort or Mini DisplayPort cable.
C. Unplug HDMI cable.
D. Switch input source on monitor to DisplayPort or Mini DisplayPort. Now you will be back to 60Hz.
 
ataq said:
Just got my P2715Q. Amazing Panel, but very ugly design compared to the U2515H which i bought just a week before.
Best bang for buck U2515H, just amazing display. If you want retina quality, there is only one way.. :)

btw, I'm sending the U2515H back and will keep the 4k display. I'm running a late 2013 mbp with "just" iris pro.
Click to expand...
How is this working out for you? Have you noticed a discernible lag? I'm thinking of getting the Skylake 13" when it comes out but only if it can fully drive a 4k display.
 
blahbrah said:
How is this working out for you? Have you noticed a discernible lag? I'm thinking of getting the Skylake 13" when it comes out but only if it can fully drive a 4k display.
Click to expand...

As MrX8503 above is correct, the 2015 13" macbook pro can drive fully drive a 4K @60 and a 4K @30 at the same time
 
Hi there,

I have had this monitor for about 2 months now, the P2715Q that is. Do you guys have perfect whites on this monitor? It seemst that my monitor has the lower part of the screen slightly yellow, even when I use my i1display pro calibrator. Should I ask for a replacement? Will I get a refurbished one? Is the yellowness normal and there is no perfect white screen since it's P series (vs U series)?
 
zeiter said:
Hi there,

I have had this monitor for about 2 months now, the P2715Q that is. Do you guys have perfect whites on this monitor? It seemst that my monitor has the lower part of the screen slightly yellow, even when I use my i1display pro calibrator. Should I ask for a replacement? Will I get a refurbished one? Is the yellowness normal and there is no perfect white screen since it's P series (vs U series)?
Click to expand...

Most monitors have some sort of uniformity issues. Your i1display pro software should allow you to measure white uniformity. It will give you a quantitive vs qualitative measurement of white uniformity. For reference here's PCmonitors review for Dell D2415Q I know you mentioned P2715Q, but at least this will give you an idea:

https://pcmonitors.info/reviews/dell-p2415q/

Here's my Dell D2415Q white uniformity result with i1display pro calibrator from this thread.

https://forums.macrumors.com/thread...-4k-ips-displays.1816805/page-8#post-20470661

Calibration will not help correct uniformity issues. Also you might try the uniformity compensation these monitors provide. You loose some ability to adjust settings but it might help. Good luck.
 
zeiter said:
Hi there,

I have had this monitor for about 2 months now, the P2715Q that is. Do you guys have perfect whites on this monitor? It seemst that my monitor has the lower part of the screen slightly yellow, even when I use my i1display pro calibrator. Should I ask for a replacement? Will I get a refurbished one? Is the yellowness normal and there is no perfect white screen since it's P series (vs U series)?
Click to expand...

Unfortunately with lower priced monitors color uniformity isn't always the greatest. I tried two iMacs a year ago and both had the same warming on the bottom third of their screens. For me it was a deal breaker and I stuck with my expensive NEC display. To get near-perfect uniformity you more than likely have to step up to a higher tier Dell with "Premiere Color" or play the swap game with Dell until you get one you're happy with.
 
I've had a Samsung u28e590d for a week and a half now, while the 4k is awesome the monitor has to be so bright or everything washes out. Is this the same thing on the p2715q? I'm thinking of returning the Samsung to get this.
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back