Please let's have a clean list of current OC results. Update when needed. At least 20 minutes of Furmark's 'Stability Test' required. Add your own stress tests to the table if you please. My first card: Core: 875 (905 with 6970 BIOS) Memory: 1545 Volt: Standard Stability: Furmark 20m+, Starcraft II 50m replay Manufacturer: Sapphire Modded to 6970 or 6950 unlocked: Yes, to 6970 The mod and the extra volt allowed me to raise the core to 905 MHz. Stability note: Starcraft II seems better for stressing both core and memory. 20 min Furmark stable speeds was far from 20 min Stracraft II speeds. I could get 900 MHz stable on the core for 50 min Furmark, but it would cause abnormal behavior in Starcraft II within minutes (delay + black screen + return to game). I could get 1556 MHz on the memory but only 1545 MHz in Starcraft II. My second card: Core: 905 Memory: ~1450 Volt: Standard Stability: Furmark 20m+, Starcraft II 50m replay Manufacturer: Sapphire Modded to 6970 or 6950 unlocked: Yes, to 6970 Unfortunately, the second card is now showing artifacts during boot, green screen tearing and won't enter Windows when drivers are installed.