KitGuru tried the Gigabyte Z97X-UD3H-BK Black Edition Motherboard
A quote from the article:
Longevity and reliability are particularly important purchasing decisions for a component such as a motherboard. Quite simply, your system's motherboard failing can be considered not too far off a personal disaster. Gigabyte aims to put those reliability concerns at ease with the 168 hour, server-level validation process used on its Black Edition motherboards.Gigabyte Z97X-UD3H-BK Black Edition Motherboard Review @ KitGuru
The philosophy of Gigabyte's Ultra Durable Black Edition series is to offer proven reliability and durability. Gigabyte backs up those quality claims with a certificate of validation from the 168 hour stress test, as well as an enhanced warranty program which covers the motherboard for 5 years.