Can you post a pic of your motherboard/cooling setup? As others have said, cooling the VRM is important. Put a 70mm fan (such as the fan from the stock cooler) or two on it.
Does the BIOS give you LLC options? Usually Gigabyte does best with Medium LLC. Actually I think you should make sure you have the latest BIOS first. BIOS update download page for UD5 rev. 1.x: