I just got my new HIS Radeon HD 6850 1GB today .. so here's what I did:
-Uninstalled ATI Catalyst.
-Removed my 4850 512MB.
-Installed my new 6850.
-Installed new Catalyst 10.10 drivers. (Also tried 10.10c and 10.10d hotfixes)
And here is my problem: The quality of graphics seem considerably lower! (Fuzzy graphics, blurry text) in Windows 7 desktop, and some games. (Some games run perfectly though).
Has anyone got any idea what this is about? I tried to search around, and some people complain about fuzzy text when morphological AA is enabled, so I check that .. and it isn't .. so I don't know what's going. I tried maxxing out the quality in Catalyst but it had no effect on fuzziness.
Do you think it's a driver issue? Will older drivers run my 6850? Will modded drivers maybe fix this?
could it be your cables make sure their all snug and try to physically take the card out and put it in again reconnect all the cables....and try use the vga cable not the dvi. see if the problem is in there.
This is a long shot but i have had a similar problem before when upgrading from my Nvidia 8400 to my current 250GTS. Everything seemed unclear and rather fuzzy in games. Not in Windows unfortunately.
What i did to resolve it was in Device Manager, Uninstall my Drivers for my card so it "rolled back" to the previous drivers. Continued doing this until it actually came to the point where i literally had no Nvidia drivers on my PC. Was using the generic windows video drivers at that point (did all of this in Save Mode). Then downloaded the latest nvidia drivers and installed them. Fixed.
Not saying this will work for you but its worth a shot. And using older drivers for your 68xx series will not harm it in any way. Windows might just not boot up normally. Will probably have to start windows in Safe Mode.
Also try and run a registry cleaner after u uninstalled the last ATI driver. Hopefully any left over registry info would get removed. Also create a restore point before attempting all of this.
Some people upgrade there ATI drivers constantly. Which means there older ATI drivers stay on the PC and mostly the registry info and settings get carried over. Resulting in wasted disk space and uninstalling the current drivers only makes Windows rollback to the previous installed drivers.
Then again, u might just have a faulty card? Try it in another PC with your current monitor. I would suggest u do this first