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120hz - 'Corruption' help! Major annoyance!!

post #1 of 24
Thread Starter 
Hi all,

I own a Samsung 2233RZ, which I run at 120hz. I now use a AMD/ATI 6970, but previously used an ATI 5770.

The problem I have is that I intermittently get screen 'corruption' at different locations on the screen. This appears as dotted, flickering lines of about 1cm in length, and often are grouped together to form small columns - however it can often also have a more random structure.

The lines seem (I think) to 'follow' the image when scrolling - as if to suggest that it's linked to the colours that are being displayed (though I'm not fully convinced of this).

Some facts
1) corruption only occurs at 120hz, at 60hz it is fine. It happens in both 2D (desktop) and 3D (games) applications.

2) I have tried options such as 'use alternative DVI mode' in the AMD/ATI control panel.

3) I have used two gfx cards, so it's not a problem with that.


Does anyone have any idea what this problem could be?

DVI cable interference? Is this possible?? I disabled wifi and kept the DVI cable away from everything - and it still occurred.

I will try to add photos, or link to a video, later.

I really appreciate all help!!

Thanks.
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post #2 of 24
Add specs in signature please and how many monitors are you using? Just the one?

http://www.overclock.net/specs.php
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post #3 of 24
could be your dvi cable needs to be replaced, or it could not have good sheilding.

is it the cable that came with the monitor?
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post #4 of 24
try a new dual link dvi cable before you go on any further.
    
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post #5 of 24
My first thought is that it may be a bandwidth issue. You have a true 120Hz monitor from the looks of it, but I believe DVI and HDMI (1.3 and below) were designed for 60Hz signals so whatever cable you may be using might not be up to the task. (Someone correct me if I'm wrong.) You may be able to use 120Hz on some older cables, but it is not guaranteed. HDMI 1.4 is the first specification that included the extra bandwidth for which the cables have to be tested; I am not sure that DVI has had the update.

The other thought is in regards to how the monitor handles 120Hz when it is not being fed 120fps. Are you trying to play in 3D? Are you maintaining 120 frames per second from the graphics card at all times? You should try using FRAPS to determine if there is a drop in framerate below 120 when the artifacts occur.
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post #6 of 24
Thread Starter 
Filled in my specs now - I hope it appears.

Yes I have just one monitor (tried both outputs from gfx card, with same result).

It's the DVI-D Dual link cable that came with the monitor. How common is cable failure/interference? Perhaps more when operating at 120hz?
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post #7 of 24
Quote:
Originally Posted by Seirrah View Post
Filled in my specs now - I hope it appears.

Yes I have just one monitor (tried both outputs from gfx card, with same result).

It's the DVI-D Dual link cable that came with the monitor. How common is cable failure/interference? Perhaps more when operating at 120hz?
Twice as likely.

Have you tried HDMI?
post #8 of 24
Quote:
Originally Posted by Seirrah View Post
It's the DVI-D Dual link cable that came with the monitor. How common is cable failure/interference? Perhaps more when operating at 120hz?
See my post. Trying a different cable is an option but it may not help if bandwidth is the issue.
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post #9 of 24
Thread Starter 
I am using the cable that came with the monitor, so I'd like to think that it would be capable of operating at 120hz. The monitor only has a DVI input, so I cannot try HDMI.

I'm not trying to play in Stereo-3D (ie. 3dvision etc). The 'artifacts' occur in both 2D and 3D mode, so I don't think it's related to frame rate.
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post #10 of 24
Quote:
Originally Posted by Seirrah View Post
I am using the cable that came with the monitor, so I'd like to think that it would be capable of operating at 120hz. The monitor only has a DVI input, so I cannot try HDMI.

I'm not trying to play in Stereo-3D (ie. 3dvision etc). The 'artifacts' occur in both 2D and 3D mode, so I don't think it's related to frame rate.
Assuming the DVI cable is capable of the bandwidth required, and assuming issues with the games and drivers were already weeded out by you, that leads to my second culprit: If you have the monitor operating at 120Hz but are not feeding it 120fps then it could easily cause a problem.

I have yet to see a monitor with the same image processing software that TVs have to interpolate from a supplied framerate to the refresh rate. Furthermore, TVs, unless hooked to a computer, are given set framerates from devices so it is a very simple task to interpolate consistently. That is obviously not the case when using a computer. You can use FRAPS to see if there is a correlation between framerate and artifacting.

See if you are getting more than 120fps at all times. If you are not, see if you are getting less than 120fps when the artifacts occur (note that the artifacts need not always occur when the framerate is less than 120, but for this to be the culprit the artifacting must only start when the framerate is less than 120). You should also try lowering the graphics so that you do achieve 120fps and see if the artifacts still occur at 120Hz (this may be the sole solution if you wish to operate at 120Hz).
Edited by stargate125645 - 2/8/11 at 7:25am
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