Gigabyte will soon release another grapics card with their quiet cooler WindForce. The “Black Edition” is their mark for higher durability.
GIGABYTE Black Edition motherboards undergo an extra 168 hours (7 days) of stress testing before shipment to ensure premium quality for our customers.
During the 168 hour test, each motherboard needs to pass rigorous, full system validation testing for 1 full week. GIGABYTE has built a custom testing facility at our Taiwan (Nanping) factory.
A Certificate of Validation is included with every board, issued by the GIGABYTE factory and signed by the manufacturing VP & GM to indicate that each board has passed our highest test standards.
The quote above is from the productpage.