First of all.... My screen is a LG FLATRON L1715S (old...) with VGA only, so I'm using the adapter that came with the graphic card (VGA to DVI).
When I'm playing games with me new hd7850 I get some white horizontal lines (very clearly) on the screen.
Then I found a "solution". I discovered that when I play games at 300+ FPS I can see some very cleary horizontal lines on the screen. First I tried change my drivers and that didn't solve. So I tried other adapter and that didn't solve....
The solution is to limit the FPS at 60 or 100. But in some games I have this problem even at 60fps (Ghost Recon Future Soldier).
I only have this problem when playing games... When surfing the web or on the desktop I don't have any problem.
So I decided to make a simple test, I connected my 7850 on my 32' TV with a HDMI cable and the problem dissapears like magic.
Is this normal or not? It's a graphics card problem?