Here's a card from Saphhire that isn't voltage locked:SAPPHIRE 100352-2L Radeon HD 7950 3GB
If you can find the OC edition of this, it's also voltage unlocked.
A guy by the name of Hegemon confirmed it by giving feedback (stating that the card is not voltage locked). If you click on feedback, you should see his comment at the bottom.Here's his feedback:Pros: Great card for overclocking. Ive got it at 1150 core clock and 1500 mem clock at stock voltage.
Voltage is NOT locked.
Fans are insanely quiet and the card runs very cool (maxes out at 61c with my overclock using default fan profile!).
Two free games just to make it even more of a great buy.
Cons: I wish the 6 pin plugs were on the end of the card instead of the side.Edited by mark_thaddeus - 2/25/13 at 9:03pm