hd 6850 to hd 7850 2GB problem possible dead videocard

I started the computer up today and had the same graphical problems but was able to finally get the system to boot up after unplugging the videocard power and restarting a few times. I installed GPUTweak and set the 2d clock to 500MHz core and left the memory clock at the default 1200MHz. It seems like the videocard has recovered from its little spat but I guess the only way to find out is to run a game or two and see what happens lol. Just a quick question: Do you have to run CCC and GPUTweak at the same time? I kind of want to keep both running but I've never run one of these third party GPU overclocking programs before.

Update

I decided to update my motherboard bios and kept the new 500MHz 2d settings on the videocard. What happened is after I exited a game the screen gave me the vertical lines thing that people have been complaining about but after the driver recovered (this is only the second time the system has actually given me that message which is strange) it seems the videocard is stable again. Any thoughts?