Samsung SMS27A850 monitor not Displaying at 2560x1440

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Level 1

8 points

Samsung SMS27A850 monitor not Displaying at 2560x1440

I recently got and hooked up my Late 2013 Mac Pro and I am having trouble when connecting to my monitors. I have two 27" Samsung SMS27A850's with a native resolution of 2560 x01440, but the Mac Pro see's them as 24" monitors with a native resolution of 1920 x 1080. I've scoured the web and my IT guy has looked at it too, but cannot find a way to get it to work at the correct resolution. My previous 09 Mac Pro had no problems with these monitors at all.

My current machine is spec'd as follows:

3Ghz 8-Core

64GB if RAM

AMD FirePro D700

Posted on Mar 3, 2015 1:08 PM

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Answer 1

lllaass

Level 10

210,411 points

Mar 3, 2015 1:16 PM in response to ChrisTCS

How are they connected? If via DVI you need dual-link adopter, about $99 each

Mac Pro (Late 2013): Using multiple displays - Apple Support

This shows DVI only

http://www.samsung.com/us/computer/monitors/LS27A850DS/ZA

here is the adopter, one for each monitor is needed

http://store.apple.com/us/product/MB571Z/A/mini-displayport-to-dual-link-dvi-ada pter

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Answer 2

ChrisTCS Author

Level 1

8 points

Mar 3, 2015 2:28 PM in response to lllaass

I am using 2 Mini DisplayPort to DVI Adapters. I guess this is my problem? Will I need two of these Dual Link adapters?

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Answer 3

ChrisTCS Author

Level 1

8 points

Mar 3, 2015 2:31 PM in response to ChrisTCS

My apologies, I didn't hit "see more" to read the rest of your post. Thanks for the help, I'll give this a shot!

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Answer 4

lllaass

Level 10

210,411 points

Mar 3, 2015 2:32 PM in response to ChrisTCS

You need one dual-link adopter for each monitor, thus total of two $99 adopters.

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Answer 5

DPArt

Level 3

604 points

Mar 4, 2015 4:34 PM in response to lllaass

you would be much better off to connect via MDP to DP

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Answer 6

lllaass

Level 10

210,411 points

Mar 5, 2015 2:04 AM in response to DPArt

But the description only lists a DVI input.

DPArt wrote:

you would be much better off to connect via MDP to DP

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Answer 7

Mar 5, 2015 7:33 PM in response to lllaass

It has both DVI and DisplayPort inputs.

Use Mini DisplayPort to DisplayPort cables.

<http://www.monoprice.com/Category?c_id=102&cp_id=10246&cs_id=1024606>

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Answer 8

joanwolk

Level 1

14 points

Feb 24, 2016 1:52 AM in response to ChrisTCS

I know this reply is quite late, but I found this post while I was having a similar issue with the same model of display. I have an HDMI-to-MiniDisplayPort cable. I was able to resolve the issue by using the menu button on the monitor itself, going to the "Size & Position" menu, then changing the "Image Size" from "Auto" to "Wide". It causes the refresh rate to be locked at 60 Hz, but that's ok by me.

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