Acer XG270HU not displaying 1440p 144Hz

Mentis · September 30, 2016

So I just got this monitor, connected to a Sapphire R9 Fury Nitro through display port with the cable provided in the box (I suppose Acer provided a cable that will allow me to take full advantage of the display). So I have not being able to run 1440p @144Hz so far.

The display has a setting that allows me to switch between DP1.1 and DP1.2. So for the troubleshooting I've done:

1) DP1.2: Maximum 1440p refresh rate is 60Hz while I can run 144Hz on 1080p

2) DP1.1: Maximum 1440p refresh rate is 100Hz

3) When I restart Windows, the maximum refresh rate is 60Hz on DP1.2, however when I change the DP connection on the GPU (I have three), the maximum is 144Hz again, however it won't apply (the monitor displays "no signa"l)

4) Connection through HDMI gives a maximum refresh rate of 60Hz for both 1440p and 1080p.

I really want to use the FreeSync feature, so I don't care about HDMI. Any clues please?

Thank you in advance

Spork829 · September 30, 2016

That's...strange. Try a different cable and a different GPU if possible.

Mentis · September 30, 2016

2 hours ago, Spork829 said:

That's...strange. Try a different cable and a different GPU if possible.

I don't have a different GPU, but I tried many cables (HDMI, DVI Dual-link, DP, DP to HDMI). Only the DP connection gives the 144Hz, others are maxed at 60Hz even for 1080p. I will send the monitor back tomorrow even though I'm sceptical that it is a driver problem. I called ACER and they told me to send it for repair so they replace the firmware, but the re-seller told me I can't replace it if it doesn't work after the repair. So I'll just get it replaced, and if the new one doesn't work, I'll try to get a re-fund under the title of "incompatible/non-functioning product".

I don't understand pixel clock very well, but I know that AMD has their limited to 400MHz. While using softwares like CRU indicates that I need a 550-600MHz pixel clock to run 1440p @144Hz. How do people with AMD cards are managing to get such resolution with this limitation? (that's the only possible explanation I have for now...)

I really wanted a 1440p 144Hz monitor

Spork829 · September 30, 2016

22 minutes ago, Mentis said:

I don't have a different GPU, but I tried many cables (HDMI, DVI Dual-link, DP, DP to HDMI). Only the DP connection gives the 144Hz, others are maxed at 60Hz even for 1080p. I will send the monitor back tomorrow even though I'm sceptical that it is a driver problem. I called ACER and they told me to send it for repair so they replace the firmware, but the re-seller told me I can't replace it if it doesn't work after the repair. So I'll just get it replaced, and if the new one doesn't work, I'll try to get a re-fund under the title of "incompatible/non-functioning product".

I don't understand pixel clock very well, but I know that AMD has their limited to 400MHz. While using softwares like CRU indicates that I need a 550-600MHz pixel clock to run 1440p @144Hz. How do people with AMD cards are managing to get such resolution with this limitation? (that's the only possible explanation I have for now...)

I really wanted a 1440p 144Hz monitor

Yeah I guess it sounds like a firmware issue. As for the pixel clocks I have basically no knowledge of that either. Hopefully you can get one up and running soon!

Mentis · October 5, 2016

So just to answer this if anyone happens to come across this, I sent the monitor for replacement and the new one works as expected with the DP cable provided. It's nice to see the refresh rate in the monitor OSD changes dynamically It would have been perfect only if it didn't have that one dead pixel on the upper left corner that I have to live with and stare at every day until I get a new monitor