How can I dirve my 4K monitor with Radeon R5 230?

[Jan Van]

Hello,

I have bought a Radeon R5 230 which should be capable of 4K. But it doesn't work with my ASUS PB287Q. I don't need high gaming performance, just a high a resolution monitor for big spreadsheets.

Tanks, Jan

 

[bicycle_repair_man]

That GPU is only 4K capable if you use HDMI which conforms to v1.4a. The refresh rate is also reduced to 30hz.

 

[Jan Van]

Thanks Bicycle_repair_man,

I am using a High Speed HDMI cable so that part should be ok.

ASUS told me yesterday it might be caused by MHL limiting both my HMDI inputs to 1080 vertical resolution. Can this be the cause? If so, how to solve it?

 

[RobCrezz]

In what way does it not work?

Are you selecting the resolution and 30hz in the AMD drivers or through the regular windows display settings?

 

[Jan Van]

If I try to set the resolution through the AMD Catalist Control Center (option: My Digital Flat Panels > Custom Resolutions) to 3840 x 2160 @ 24 Hz, the response is: The custom resolution settings are not compatible with this display. Reconfigure your settings and try again.

 

[Jan Van]

I solved it after 1.5 weeks of frustration. The Sapphire helpdesk said i should use a 4K specified cable. But various internet sites contradictory argued you don't need an expensive cable "high speed" HDMI is good enough. The helpdesk advised to buy a 4K specified cable or return the card. In an ultimate attempt I tried to set the fps at 12Hz and, miracle, miracle, now I could set the resolution to 4K. Then I gradually increased the fps to max 20 Hz using timing standard CVT. With timing standard CVT-reduced black image it even went to 24 Hz. This works now at my home with "High speed" and even "standard" and 1.3a indicated HMDI cables
It might be that each combination card-cable-monitor has its limmitations depending on the surroundings and electrical set up. Might be that a shorter or higher quality cable could accomodate 4K 24 Hz right away. Anyway I didn't want to spend 45 euro on an expensive cable for a 60 euro graphics card.

For Plan B I also bought a Nvidia GT 730. With removed mother board this card recognized the 4K already during software installation. But the cooling turned out not to permantently fitt my computer. So I will return this one.

Thanks for contributing!

 

[RobCrezz]

Doesnt need to be a "expensive" cable, just one built to the correct standard.

 

[cioroianu]

Hi,

This issue is very confusing. It took me a while to figure it out. I couldn't get a higher resolution than 1080 with hdmi or vga cable no matter what. Checked monitor and video card settings and drivers, nothing.

Nothing helped on this thread so far so, the solution that worked for me was the DVI DUAL LINK cable which costs about 12 Euro. Connected with DVI then right click on desktop -> Display Settings and I was able to adjust resolution to 4K.

Be aware that everything on the screen will be minuscule so no one will be able to use that resolution. There are two options to correct that:

1. increase scaling to 150% (this still not working for older programs such MS Outlook)
2. change the resolution to 2560 X 1440 with scaling of 150%, which makes acceptable

My hardware as follows:

Video card: MSI Radeon™ R5 230, 1GB DDR3, 64-bit
Monitor: Monitor LED TN AOC 28", UHD, DVI, HDMI, DP, U2879VF

Happy cableing!