All four cards are reference models and have been tested but not unlocked:

• Two Sapphire 6950s
• One HIS 6950
• One MSI 6950

Please click below to purchase through Amazon.com
http://www.amazon.com/gp/shops/storefront/index.html?ie=UTF8&marketplaceID=ATVPDKIKX0DER&sellerID=A2JFX8KZELIYTP