Flickering, weird fix?

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Joined
17 Feb 2014
Posts
1,235
Having a bit of a strange problem and have no idea what is causing it.
My PC:
i5 3570K
8.00GB Dual-Channel DDR3
Z77-D3H
Radeon HD 7870 x-edition
Seasonic G series 650w

I am using the 34UM95 LG 21:9 (3440x1440) monitor.
My GPU only has a HDMI and 2 DVI outputs, so am using the HDMI for the monitor. (50hertz for now)
And i seem to be getting a lot of flickering. especially when i maximize a window like steam.

The only way i found a fix for this, is by oddly connecting a second display at the same time via DVI. Which fixes everything. But I don't want the display as selling.

Any ideas what's wrong here?

Thanks in advance.
 
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