Did you connect the 6-pin power connector to the video card when you installed it?
Are the drivers properly installed (latest from AMD's site)?
Check your windows power management settings, and set them to max performance, check catalyst control center's power settings, and check the clock speeds on the GPU to make sure it's not being underclocked.
Thanks for the suggestions. Changed Win7 power to high performance and have the latest AMD drivers. Also checked the card hookup and it is 6 pin connector attached. I am not finding a firmward upgrade for HD 7770 but I have opened a ticket with Sapphire. I'll keep you posted.
I overlooked the OS upgrade originally, that seems like a much more likely source of problems, considering you have issues on the desktop. As jacobdrj asked, what are your other specs, is your system capable of running windows 7 smoothly?
It may be worth trying a clean install of windows (especially if you upgraded the OS without formatting), since it could be an issue with old drivers, DLLs, etc from the previous windows install.
What OS are you upgrading from, and did you format & reinstall, just reinstall, or simply upgrade the OS?
Hi here are my system specs:
MB Model: D975XBX2 System Type: x64-based PC
Processor Intel Core2 CPU X6800 @ 2.93GHz, 2926 Mhz, 2 Core, 2 Logical Processor(s)
Memory: 4 GB DDR2 800 MHz
Power Supply: NZXT 400W
2 X 500 GB HD