You can flash any 6950 even if it has no bios switch, but you wouldn't have the safety of the backup bios if things were to go wrong. I don't have a clue whether they unlock or not though.
There is a possibility they might not unlock at all.
If it's low noise your after with the 6950,I can recommend the AC Xtreme 5870 with a couple of extra heatsinks. You won't hear it over your case fans if you leave the fan on automatic with CCC even when playing games. Xfire can be done if your mb has the space between pci-e slots as the card goes from 2 slots to 3.
There is a possibility they might not unlock at all.
If it's low noise your after with the 6950,I can recommend the AC Xtreme 5870 with a couple of extra heatsinks. You won't hear it over your case fans if you leave the fan on automatic with CCC even when playing games. Xfire can be done if your mb has the space between pci-e slots as the card goes from 2 slots to 3.
