I just got in a second Gigabyte 6950 for a friend of mine and I have been testing it along side my Gigabyte 6950. The cards look the same, and are model numbered the same, but seem very different in terms of overclocking, voltages, power control, etc. For example, My card uses VID4 for 3D voltage, the new card uses VID3. Afterburner can adjust the new cards voltage, but not my card. My card reads 1.065v for the stock voltage in Afterburner, Komubustor, etc, while the new card reads 1.100v. I overclock my card with Trixx and have NEVER seen the card throttles its clock speeds down. With the new card I must set my clocks, close Trixx, then apply 20% powertune in CCC otherwise the card throttles it speeds down under load. I've just started messing with the second card, so maybe tonight after work I will get some more comparison info, but this goes to prove that even two cards, same model, from the same manufacturer, can be very different cards. This is why I suggest using your cards EXACT bios and modifying it. Who knows if the cards may use different ram/timings/ram voltages or anything else for that matter.
