My current list of things to try:

• 1. Set thread concurrency to 4100
• 2. Set thread concurrency to 4098
• 3. Use CGminer 3.1.1
• 4. Use CGminer 3.0.1
• 5. Install Catalyst 13.9
• 6. Install Catalyst 13.4
• 7. Install Catalyst 12.8
• 8. Install Debian Linux on a different partition, and use it to mine