2 reference 7970s for sale.
1 Diamond and 1 Sapphire. Both are stock 925MHz. core clocks. Both will do 1125MHz. on stock voltage. Don't know if they will do more I never tried to take them higher. Both have a dual bios switch and are voltage unlocked AFAIK. I have video adapters if you need them.
$235 each shipped. Amazon payments preferred.