28 inch 4k panel Radeon 6850 could not get 60hz refresh rate

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Sep 1, 2015
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Hi,

newbie here. I had to register coz Ive ran out of options.

I have an i5 2500 with 8gb of ram and running a gigabyte radeon hd 6850 and just purchased a Acer CB280HK 4k monitor.

I have a couple of issues.
when I set it to the highest 4k resolution, my welcome screen (windows 7) resizes to what it appears to me a native resolution that my screen can take 2560 x 1600 but when I log into my profile all is good.

the second issue is I can't seem to adjust the refresh rate to 60hz without going 1080p. i tried to at least match the gpu's max resolution but the best i get is 30hz. The acer 4k monitor can go up to 4k@ 60hz.

any suggestions?

Thanks!

JT
 
Solution
It's the Displayport 1.2 that card has which is only 17.28 Gbit/s, good for up to 4k at 30Hz or 1440p at 120Hz at 32-bit color

Theoretically that's also enough for 4k 60Hz at 24-bit color so you may wish to try that.