ASUS PG248 Swift OC problems

[xRaDeRx1]

So have a PG248 swift monitor that work perfectly normal when running it at 144hz but when I overclock it to anything above 144hz it goes black randomly for one second and then the image comes back up. So I am wondering if the problem would be a bad displayport cable, the Amd r9 290 I am using or the monitor.

The monitor is made to overclock with Geforce cards only and I don't posses one myself so I can't test if that's the problem or not.

The displayport cable I used was the cable that came with the screen.

Would be thankful if anyone knows my problem or could help me identify it.
Thanks in advance!

 

[tolagarf]

I'd say it's the displayport cable. Just because a cable was included, doesn't mean it's any good. It's probably a cheaper cut down version with less copper inside, which means when you go over a certain resolution/hz, the cable will fail. I had the exact same issue with my PG279Q, the included cable would make the screen blink with a GTX 980 Ti going over 85 Hz, but not with a GTX 970 and the reason for that is the frequency of the displayport itself, which can vary quite a bit from graphics card of different make and model.

In order to fix this you need to find a cable that's DP++ certified, most commonly referred to as 4K Ultra HD cable. But be careful, just because it's expensive doesn't mean it's any better., as I found out with Clicktronic cables.