I won a HD 6870 at a lan recently and after install the words "TESTVBIOS" are displayed at the top of the screen at all times. This includes start-up screens and any games being played. I'm not familiar with BIOS settings and I haven't made any attempt to change them. The words only appear with the 6870 installed and dissappear with my old card in.
Motherboard: ASUS P6T, X58 chipset
CPU: Intel Core i7 940
RAM: 12 gigs DDR3, 3 sticks
Video Card: Radeon HD 6870
Operating System: Windows 7 Premium
Video Card Drivers: Currently Catalyst 12.6 and have used 12.1 and up since I got the card.