Solved AMD HD 7850 issues

[kLN93]

Just got a new video card, and I'm having problems with it.

It's a gigabyte HD7850.
I replaced my old HD6570 and the performance is much much better.

The problem I'm getting is very hard to explain. There's like this fuzzy thing going on when gaming. It gets a hell of a lot worse when vsync is off. With vsync on it's almost gone. And I can see it best when looking at things with a black/dark background. I would just leave Vsync on, but then the fps is limited to 30 which is real choppy.

This is only happening during gaming. And it is doing it for Far Cry 3 and Halo PC. It's worse for Halo PC probably because of the darker colours.

My friend said to me there's a problem with your output

It looks like other people have this problem too Solved: Something wrong with my new HD7850? - AnandTech Forums

"I can also confirm that using the DVI output from the Sapphire 7850 does indeed work well if you don't use a dvi to vga adapter. I've tried three different adapters and get the same weird horizontal lines."

 

[Faladu]

...and you are able to make that cable adjustment? and it worked....?

Hardware gets some weird 'features' sometimes, and you get stuck working around them, or mentioning to the support of the product and hope they are able to get a firmware fix for it.

 

[kLN93]

Yes, I ditched the VGI adapter and purchased a VGA to DVI cable, and the problem is gone.

 

[BrianBoi]

funny, I have just posted this exact same problem in another forum... I would not have thought about that converter though :/ (I obviously have one on mine). Will try it without but looks like I will have to get a cable first.

 

[kLN93]

funny, I have just posted this exact same problem in another forum... I would not have thought about that converter though :/ (I obviously have one on mine). Will try it without but looks like I will have to get a cable first.

Buy a VGA to DVI cable and your problem should be solved

 

[MPN]

Thank you so much for this thread!
I also get flickering on my screen with my 7970 when playing games, no matter what i do with the video options in the game.
And ive tried so many things to get rid of the problem but no luck. But this is some thing i gota try out and see if it works.
But what cable do you get the best quality from, DVI or VGA?

 

[BrianBoi]

Buy a VGA to DVI cable and your problem should be solved

Awesome!! I'll do you one better though , I have just ordered a HDMI to VGA cable (my monitor still has a vga port on it xD). Should be getting that sometime today or tomorrow and will let you all know how it goes... but the outcome should be the same!!

Thank you again

Thank you so much for this thread!
But what cable do you get the best quality from, DVI or VGA?

I would imagine a DVI would provide better quality than VGA, or even better use the HDMI output from you card (provided your version has one that is)

 

[essenbe]

The signal from a DVI and HDMI are the same. The HDMI just also carries sound, but the video is the same.

 

[BrianBoi]

The signal from a DVI and HDMI are the same. The HDMI just also carries sound, but the video is the same.

Now its interesting that you mention that, because when I plugged my cable in, my monitor didn't detect that it had an input and said please check the cable as there is no signal.

Let me just check that I understood what you meant from your post, basically it doesn't matter what's on the end of the HDMI/DVI cable because HDMI and DVI outputs are the same disregarding the sound ability?

Is there a reason then why my monitor doesnt detect the output when I use an HDMI to VGA cable compared to when I use the VGA(with DVI adapter) to VGA cable?

 

[essenbe]

Your monitor should have a menu on it. You have to tell the monitor what type signal it is going to receive, otherwise it doesn't recognize it. That may not be the case if your monitor only has a VGA input. In that case you can only use a VGA input. It does not have to be told what type signal it is going to get because it can only receive 1 type. AS far as I know, If you use an adaptor it Should make no difference, but some adaptors have problems with the transition from one type of signal to another. I would use whatever type works best for you and your monitor.

 

[BrianBoi]

That may not be the case if your monitor only has a VGA input. In that case you can only use a VGA input. It does not have to be told what type signal it is going to get because it can only receive 1 type

Like you said, mine only has the one input on the monitor side, and that is indeed a VGA port.

AS far as I know, If you use an adaptor it Should make no difference, but some adaptors have problems with the transition from one type of signal to another. I would use whatever type works best for you and your monitor.

Im using a DVI-I to VGA adaptor currently and that is what is causing these weird uneven lines on dark colours (grey and black) and hense why I thought switching to a HDMI - VGA cable would solve the problem. Alas I am now on the hunt for a DVI-I - VGA cable so that I can remove the adaptor and hopefully get rid of the this problem

 

[BrianBoi]

Buy a VGA to DVI cable and your problem should be solved

Hey kLN93 and everyone who has done this fix. So I swapped out my adaptor for a DVI to VGA cable and loan behold the problem was gone. How ever this has caused a new one xD, did any of you have a problem with ghosting when just using the cable? It is quite bad in the corners of my monitor and I didnt have this problem before when using the adaptor and cable??

Nothing can ever be a simple fix...