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27" QNIX QX2710 DPort overclocking

post #1 of 7
Thread Starter 
Well first of all, hello everyone! this is my first post on overclock.net! I got to say this website has always been very helpful to me and it was about time I joined smile.gif

So I bought a Qnix QX2710 DP/HDMI/DVi a couple days ago,under the impression that it was worth paying a bit more for the extra ports,this way I can plug multiple devices (pc,gaming consoles,ect..) on it at the same time.I thought that the DP version being essentially the same model and using the same panel would perform just as good as the DVi only version...But now I'm having trouble overclocking it and I need some help guys.

I am currently using a Radeon 7870 with the latest drivers,the monitor is plugged in the GFX DL-dvi port with the cable that came with it and I use CRU with the pixel patch for overclocking.First I'd like to mention that I have been able to bring it up to 75hz via windows,but on low resolutions.But when trying in 1440p so far I've had 2 different sorts of result when overclocking:

At first I brought it up to 96hz in CRU,put the preset on top of the list and did a reboot,windows started normally and the screen was working,but when I went to the windows monitor settings page,there was no frequency options listed in the drop down menu,it was completely blank,there wasn't even a 60hz option.

So I repeated the same process maybe 4-5 times while changing some options in the CCC (like lower freq at high res) or lowering the desired refresh rate in CRU or even lowering both the refresh rate and the resolution (down to 1920x1080),but it was always yielding the same result.

Then I used the reset option in the CRU and re-applied the patch before trying it again.From there it got even worse,now when I bring the refresh rate up even as low as 65hz,the monitor doesn't even work after the reboot.

So here are some questions I have:

-As anyone ever been able to OC one of those?

-If it cannot be overclocked,why is it? And is there a way to fix that?

-Would a DP cable yield better results?

-Is it easier to OC with Nvidia cards and drivers? (I have a spare GTX560Ti that I could use).
post #2 of 7
As far as I know, the DP monitors don't have the same, simple DVI controller as the cheaper ones, and I don't think they OC well.

But I remember having a similar issue with CRU. Make sure you have the right monitor selected in the drop down menu, and that that you're running test mode.
Bruce
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Bruce
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by brucethemoose View Post

As far as I know, the DP monitors don't have the same, simple DVI controller as the cheaper ones, and I don't think they OC well.

But I remember having a similar issue with CRU. Make sure you have the right monitor selected in the drop down menu, and that that you're running test mode.

After reading what you said about the dvi controller,I decided to plug the monitor in hdmi.My 7870 doesn't have an hdmi port but I found a old dvi->hdmi adapter lying around,so I used that to plug the monitor on the gfx dl-dvi slot,but with an hdmi cable.And, it actually works.Right now I'm running it stable at 65hz but I managed to bring it up to 75hz, with some screen flashing though.Right now I'm thinking the hdmi adapter might be acting as a bottleneck,although I'm not to sure about that and it might just be the monitor.

But my 7870 has 2 DP ports so I'm going to order a DP cable and try to OC at higher frequencies with it,hopefully it will yield good results,I will post them here once the testing is done.
post #4 of 7
Quote:
Originally Posted by Jolin07 View Post

After reading what you said about the dvi controller,I decided to plug the monitor in hdmi.My 7870 doesn't have an hdmi port but I found a old dvi->hdmi adapter lying around,so I used that to plug the monitor on the gfx dl-dvi slot,but with an hdmi cable.And, it actually works.Right now I'm running it stable at 65hz but I managed to bring it up to 75hz, with some screen flashing though.Right now I'm thinking the hdmi adapter might be acting as a bottleneck,although I'm not to sure about that and it might just be the monitor.

But my 7870 has 2 DP ports so I'm going to order a DP cable and try to OC at higher frequencies with it,hopefully it will yield good results,I will post them here once the testing is done.
If you monitor using HDMI through a dvi converter, you are not running it at native resolution. Stick to DisplayPort, otherwise use a DL-DVI cable. Otherwise, you just bought an overly expensive 1080p monitor.
post #5 of 7
Thread Starter 
Quote:
Originally Posted by kevinsbane View Post

If you monitor using HDMI through a dvi converter, you are not running it at native resolution. Stick to DisplayPort, otherwise use a DL-DVI cable. Otherwise, you just bought an overly expensive 1080p monitor.

Well I don't know much on the subject,but right now it's running a resolution of 2560x1440,with the hdmi converter.Personally I don't really see a difference in quality when using this or the dl-dvi,I might be totally wrong though,but the reason why I'm using it is because I can play with the refresh rates,for some reason I can't do that when using the dl-dvi port.
post #6 of 7
Quote:
Originally Posted by Jolin07 View Post

Well I don't know much on the subject,but right now it's running a resolution of 2560x1440,with the hdmi converter.Personally I don't really see a difference in quality when using this or the dl-dvi,I might be totally wrong though,but the reason why I'm using it is because I can play with the refresh rates,for some reason I can't do that when using the dl-dvi port.
Oh, I see, you're going from DL-DVI to HDMI on the monitor. Not impossible, but you are dropping half of your least significant signal information from the data stream. That is to say, you are getting somewhat more than half of the image quality available to you. This is due to how DL-DVI works, and how DL-DVI signals interact with HDMI. You are definitely losing image quality, even if you don't notice it at first glance.

The other thing is that no multi-input monitor has ever been shown to overclock - therefore, I would definitely stick with a native input (DisplayPort or DL-DVI) and not mess around with trying to overclock a monitor that almost certainly can't do it, while losing a significant portion of video data that's being sent to your monitor.
post #7 of 7
Hi I am thinking of buying the same monitor with all the extra outputs. Did you get it to overclock with the new DVI cables?
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