Dell P2715Q and P2415Q 4K IPS Displays

KenV54 · Feb 27, 2015

If anyone happens to have a DP to HDMI adapter cable (DP male, HDMI female) and can try to run a secondary monitor from the DP out to HDMI in on the second monitor, I would appreciate your trying that and reporting back.

I am running the rMBP 15" mDP-out (from the TB port, obviously) to DP-in on the P2415Q, and it works beautifully, with full 3840x2160 60 hz resolution. My other monitor is an old Dell ST2310, with HDMI, VGA and DVI in, and I can run it only from the HDMI out on the rMBP to the HDMI in on the monitor. I would like to be able to run from the P2415Q DP-out to the HDMI-in on the ST2310.

I don't know if I have a bad DP to HDMI adapter, a bad DP out port on the P2415Q, or if it just can't be done in principle.

Thanks very much.

ixxx69 · Feb 27, 2015

KenV54 said:
I would like to be able to run from the P2415Q DP-out to the HDMI-in on the ST2310.

I'm not 100% sure, but my understanding is that requires the use of MST which isn't supported natively in OS X/graphic drivers... and even if it was, the single DP 1.2 doesn't have the bandwidth to support both a 4K display and an additional display at the same time.

KenV54 · Feb 27, 2015

ixxx69 said:
I'm not 100% sure, but my understanding is that requires the use of MST which isn't supported natively in OS X/graphic drivers... and even if it was, the single DP 1.2 doesn't have the bandwidth to support both a 4K display and an additional display at the same time.

I think that's correct, form a Google search I just did. It's possible that running Windows from Boot Camp will allow the DP daisy chaining, because Windows has the right drivers for the NVIDIA card in the rMBP late 2013 and later. I'll have to try that to see if the DP out will translate into an HDMI signal and work w Windows in BC, and I'll report back later.

Edit: I just booted my rMBP from Boot Camp directly, Windows 10 Preview, and it does not seem to push a signal through the DP-out to HDMI in on the old Dell ST2310 monitor. Whether it would push one out through the DP port on the P2415Q to a DP in port on another 4K monitor, I don't know. The HDMI out from the rMBP to either or both monitors does work, though, when booting from Boot Camp Win 10 Preview.

tomislavf · Feb 28, 2015

Does your monitor go to sleep automatically? After the time set in "Energy Saver"?

I have the 2415Q and a MBP Retina 13" connected via displayport. Yosemite.

cmhsam · Feb 28, 2015

Picked one up today. Pic looks amazing. When connected to the late 2014 15" rMBP with dedicated GPU via mini display port to display port is it best to leave display settings to "best for monitor" or are people using scaled? If scaled what resolution?

ixxx69 · Feb 28, 2015

cmhsam said:
is it best to leave display settings to "best for monitor" or are people using scaled? If scaled what resolution?

The sharpest quality will probably be leaving it as it is (which should be HiDPI 1920x1080). However, the other HiDPI settings look really good as well. Just try them out and see what you like best.

cmhsam · Mar 2, 2015

Anyone running VMware fusion with the 2715? On my late 2014 15" mbpro and dedicated gpu performance in the vm seems slow on a 4k vs traditional 1080 monitor. The vm is setup to allow for dual cpu's and 8gb ram. I did some research on the VMware forums and it looks like workstation 11 is needed which I have but perf still seems very laggy and slow. When connecting my u2412hm which is a 1900x1200 monitor the vm performance returns to normal.

theSeb · Mar 2, 2015

cmhsam said:
Anyone running VMware fusion with the 2715? On my late 2014 15" mbpro and dedicated gpu performance in the vm seems slow on a 4k vs traditional 1080 monitor. The vm is setup to allow for dual cpu's and 8gb ram. I did some research on the VMware forums and it looks like workstation 11 is needed which I have but perf still seems very laggy and slow. When connecting my u2412hm which is a 1900x1200 monitor the vm performance returns to normal.

All of my Yosemite VMware fusion virtual machines are very laggy, no matter what monitor is connected. I never had this problem with Mavericks.

cmhsam · Mar 2, 2015

It seems to work ok with my 1080p monitors. Noticeably worse with the 4k

KenV54 · Mar 2, 2015

cmhsam said:
Anyone running VMware fusion with the 2715? On my late 2014 15" mbpro and dedicated gpu performance in the vm seems slow on a 4k vs traditional 1080 monitor. The vm is setup to allow for dual cpu's and 8gb ram. I did some research on the VMware forums and it looks like workstation 11 is needed which I have but perf still seems very laggy and slow. When connecting my u2412hm which is a 1900x1200 monitor the vm performance returns to normal.

I have the P2415Q, MacBook Pro Retina 15" w 16 GB RAM, 1536 MB video integrated RAM, and an Nvidia discrete video w 2 GB RAM, Yosemite, Parallels w Win 10 Preview. Not exactly the same as your system, but some similarities.

I agree with theSeb above that the VMs seem to run laggier with Yosemite. But I changed the memory allocation in the VM config to 4 GB and the video RAM allocation to 768 MB (it is using the Nvideo card), and it runs fairly well. Also, there's no easy way to change the resolution in the VM to get a super crisp 1920x1080 screen as I can do on the Mac Desktop, but I can adjust the text and icon size in Windows to "Extra extra large" and that seems to accomplish the same thing.

cmhsam · Mar 2, 2015

KenV54 said:
I have the P2415Q, MacBook Pro Retina 15" w 16 GB RAM, 1536 MB video integrated RAM, and an Nvidia discrete video w 2 GB RAM, Yosemite, Parallels w Win 10 Preview. Not exactly the same as your system, but some similarities.

I agree with theSeb above that the VMs seem to run laggier with Yosemite. But I changed the memory allocation in the VM config to 4 GB and the video RAM allocation to 768 MB (it is using the Nvideo card), and it runs fairly well. Also, there's no easy way to change the resolution in the VM to get a super crisp 1920x1080 screen as I can do on the Mac Desktop, but I can adjust the text and icon size in Windows to "Extra extra large" and that seems to accomplish the same thing.

Thanks for all the help but after spending way too much time working on this I decided to go back to my dual 24" monitor setup. I use VMWARE Workstation on a regular basis too much to the point where the performance issue was too much for me. Looks like I will be sending back this display to Amazon

ra004e · Mar 2, 2015

cmhsam said:
Thanks for all the help but after spending way too much time working on this I decided to go back to my dual 24" monitor setup. I use VMWARE Workstation on a regular basis too much to the point where the performance issue was too much for me. Looks like I will be sending back this display to Amazon

If you're still looking for a great display that works really well with VMware, might want to look into Dell U2515H. I have it hooked up to 2013 15" rMBP and VMware fusion 7 seems very performant, plus none of the scaling issues with HiDPi displays. Worth a look. Here's a review of display if you need it.

http://www.tftcentral.co.uk/reviews/dell_u2515h.htm

cmhsam · Mar 2, 2015

ra004e said:
If you're still looking for a great display that works really well with VMware, might want to look into Dell U2515H. I have it hooked up to 2013 15" rMBP and VMware fusion 7 seems very performant, plus none of the scaling issues with HiDPi displays. Worth a look. Here's a review of display if you need it.

http://www.tftcentral.co.uk/reviews/dell_u2515h.htm

Thank you. I am going to take a look at this

Sheza · Mar 3, 2015

ra004e said:
If you're still looking for a great display that works really well with VMware, might want to look into Dell U2515H. I have it hooked up to 2013 15" rMBP and VMware fusion 7 seems very performant, plus none of the scaling issues with HiDPi displays. Worth a look. Here's a review of display if you need it.

http://www.tftcentral.co.uk/reviews/dell_u2515h.htm

Hi,

Do you use this at its native 1440p resolution or do you use a program to get it to non-pixel-doubled 1080 HiDPI?

cmhsam · Mar 3, 2015

One question I forgot to ask is on the monitor in the menu should I have it selected to SST OR MST? by default believe it comes in at sst but I switched it to MST. I am wanting to run one 27" dell 4k via TB port, a 24" 1080p monitor via the second TB port and then have the mbpro screen as my 3rd screen vs clamshell.

UPDATE: I think i may have solved my problem. Initially I had the MST settings, in the menu of the physical monitor, set from "OFF" to "SECONDARY". Changing this back to "OFF" seems to have solved the issue with performance both on the VM and Host OS X side. Will provide another update after 24 hours of use. Thank you everyone

ra004e · Mar 3, 2015

Sheza said:
Hi,

Do you use this at its native 1440p resolution or do you use a program to get it to non-pixel-doubled 1080 HiDPI?

At native 1440p, I have not tried 1080 HiDPI, but I don't think the pixel density is high enough for HiDPI, but 1440p on 25" display is a very good compromise (my opinion). As I've commented before on this monitor, AG coating is awesome and monitor has a very "clear and bright" image. I have a 5k iMac that I go back and forth with this monitor all day and never feel as I the U2515H is inferior, just what it is.

I needed a monitor to use with Mac hardware that doesn't support 4k@60Hhz and this monitor really worked for me.

WorldIRC · Mar 3, 2015

ra004e said:
If you're still looking for a great display that works really well with VMware, might want to look into Dell U2515H. I have it hooked up to 2013 15" rMBP and VMware fusion 7 seems very performant, plus none of the scaling issues with HiDPi displays. Worth a look. Here's a review of display if you need it.

http://www.tftcentral.co.uk/reviews/dell_u2515h.htm

rMBP shouldn't have any issue outputting to 2 of these @ 60hz, right?

larrysing1963 · Mar 3, 2015

Tried to capture the high PPI/DPI on the P2715Q which I have scaled to 1920x1080 HiDPI. It's so very clear, almost as if looking at printed paper.

Here is the image, although I don't know if you can all see the detail enough. It looks way more grainy in this picture than it looks in person.

WorldIRC · Mar 3, 2015

larrysing1963 said:
Tried to capture the high PPI/DPI on the P2715Q which I have scaled to 1920x1080 HiDPI. It's so very clear, almost as if looking at printed paper.

Here is the image, although I don't know if you can all see the detail enough. It looks way more grainy in this picture than it looks in person.

Man I wish I could push two of these on an rMBP.

wakele · Mar 4, 2015

About how blurry look no-hiDpi resolutions...have someone tried to modify the "sharpness" option in the screen OSD? For me it works, now 1080p and 1440p no-hiDpi resolutions look "normal", no blurry. The default value (50) for "sharpness" is too low for lower resolutions that 4k I guess...for me 60-70 is enough.

MacModMachine · Mar 4, 2015

for anyone who has a P2815Q , dell will swap them out with a brand new P2715Q free of charge.

i paid 299 @ microsoft store for 2 p2815q's and just received 2 replacement 2715Q's because they 2815's are discontinued due to recall.

cc32 · Mar 4, 2015

I'm on a late 2013 rMBP with GT750m discrete graphics, 16GB RAM, 1 TB SSD, 2.6GHz i7.

I got the p2715q (3840x2160) and the u2715h (2560x1440). Both displays are very nice. The 4k is sharper, more rich; text is clearer, etc. I don't think the u2715h is using HiDPI scaling (based on the Scaled Display Preferences options and what the monitor menu tells me about the res), but still looks pretty good. The p2715q is very close in clarity/quality to the retina screen on the MBP. Colors maybe not as good...glossy/matte, etc. Haven't messed with RGB though. Not a photographer, so don't really care too much. The u2715h looks almost as good except for the lower res and clarity issue. Text is noticeably more blurry, etc ("Disable LCD Smoothing" helps with that). Well, it's not 4k...

Right now I have the p2715q connected via mDP-DP @60Hz 4k, and the u2715h via HDMI @60HZ 2560x1440 in standard/landscape. Both are recognized as televisions. The u2715h does not want to do 2560x1440 in portrait with HDMI, it seems, even when connected alone. If I switch them (u2715h mDP-DP, p2715q HDMI), the u2715h will do full res in portrait, but the 4k only does 30Hz (full res though). Kinda sucks that I can't get full res in portrait via HDMI for Xcode, etc.

So my question is how best to use these displays with this rMBP. I was hoping to drive the p2715q and u2715h w the 2 TB ports and an older 1920x1080 via HDMI. Perhaps too much, I guess. I thought it was possible to get 4k@60Hz and 2560x1440@60Hz using the 2 TB ports.

Is it possible to drive both of these with mDP-DP simultaneously (one mDP-DP in each TB port)? I have not been able to get that setup to work. larrysing1963, how did you get your setup to work? Do I need SwitchResX and/or Yosemite?

MST is off in the p2715q and DP 1.2 is disabled in the u2715h.

Thanks in advance. Any help is appreciated.

larrysing1963 · Mar 4, 2015

cc32 said:
I'm on a late 2013 rMBP with GT750m discrete graphics, 16GB RAM, 1 TB SSD, 2.6GHz i7.

I got the p2715q (3840x2160) and the u2715h (2560x1440). Both displays are very nice. The 4k is sharper, more rich; text is clearer, etc. I don't think the u2715h is using HiDPI scaling (based on the Scaled Display Preferences options and what the monitor menu tells me about the res), but still looks pretty good. The p2715q is very close in clarity/quality to the retina screen on the MBP. Colors maybe not as good...glossy/matte, etc. Haven't messed with RGB though. Not a photographer, so don't really care too much. The u2715h looks almost as good except for the lower res and clarity issue. Text is noticeably more blurry, etc ("Disable LCD Smoothing" helps with that). Well, it's not 4k...

Right now I have the p2715q connected via mDP-DP @60Hz 4k, and the u2715h via HDMI @60HZ 2560x1440 in standard/landscape. Both are recognized as televisions. The u2715h does not want to do 2560x1440 in portrait with HDMI, it seems, even when connected alone. If I switch them (u2715h mDP-DP, p2715q HDMI), the u2715h will do full res in portrait, but the 4k only does 30Hz (full res though). Kinda sucks that I can't get full res in portrait via HDMI for Xcode, etc.

So my question is how best to use these displays with this rMBP. I was hoping to drive the p2715q and u2715h w the 2 TB ports and an older 1920x1080 via HDMI. Perhaps too much, I guess. I thought it was possible to get 4k@60Hz and 2560x1440@60Hz using the 2 TB ports.

Is it possible to drive both of these with mDP-DP simultaneously (one mDP-DP in each TB port)? I have not been able to get that setup to work. larrysing1963, how did you get your setup to work? Do I need SwitchResX and/or Yosemite?

MST is off in the p2715q and DP 1.2 is disabled in the u2715h.

Thanks in advance. Any help is appreciated.

Each of my monitors are using TB ports. The 34" LG is connected using an Apple TB cable, and the P2715 is connected using the DP-mDP (DP at monitor end, mDP into TB port on rMBP) and they both get 60Hz simultaneously.

If I were you, I'd leave HDMI alone unless you are forced to use it. You won't get 60Hz from HDMI at 2560x1440 without I think hacking the EDID ?

cc32 · Mar 4, 2015

Ok, thanks. Maybe I'll try a TB cable. Out of curiosity, are you able to connect the LG and the Dell w mDP-DP cables on each?

campyguy · Mar 4, 2015

cc32 said:
Maybe I'll try a TB cable. Out of curiosity, are you able to connect the LG and the Dell w mDP-DP cables on each?

Don't bother with the TB cable - it won't work. I tried, and got the "No mDP detected" message on both of my monitors (I tried each independently). These two monitors seem to require DP 1.2, and TB 1.1a.

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