Thanks to everybody for participate at the thread
Thank you for your test, in this way using an unlocked 6950 sounds to me benching with a 6970.
I understand the rule about proper hardware but the best scenario (IMHO) shall be have a separate ranking for unlocked 6950, probably difficult to manage.
A volt mod (and something else more) helps you to overclock, gain frequencies and have better perform, but not at the same frequencies