Hi @Calamity,
Just to let you know that I've switched back to my 4890.
I wanted to take a photo of the screen with the 6850 then with the 4890.
And something funny is that I was able to take a photo without any pb with the 6850, but with the 4890, no way to take a photo with the same camera settings.
Looks there is a refresh rate difference on the screen between 4890 and 6850 (unfortunately the photos don't show the blurry pb).
Photo with the 6850:
Photo with the 4890:
Here is the ArcadeOSD for the 6850:
and for the 4890:
As you can see, there is a difference with the 640 480 resolutions (2 resolutions are available for the 6850, and it's only in 640x480 that I'have a blurry screen) and the strange native resolution (720 480).
But maybe it's quite normal.
Finally, maybe there is a bug with the 2.0b3 drivers, because, my zsnes refuses to launch a game with the new drivers (and the 4890).
I didn't changed anything in my launch process : switch the resolution to 256x224, then launch the game with znes.
With the 1.2 (4890), it was working fine, but with the 2.0b3 (4890), I have this error: