HardTecs4U reports that there is an issue with many 6800U Boards with BIOS version 5.40.02.10.14, especially when used with ForceWare 61.77.
When running 3D applications for extended time there is a high chance that freezes up to several seconds occur.
This can be fixed by flashing the card with a newer BIOS - NVIDIA has been sending new BIOSes to manufacturers. Users are encouraged to upgrade at least to version 5.40.02.15.06.
However, the price of added stability with the new BIOS is decreased performance, this points in the direction of too aggressive timings in the bad BIOS.
So far the problem has only been spotted on Ultra cards.
