ASUS GTX 980 Matrix 4 GB @ techPowerUp
 

The ASUS GTX 980 Matrix is the company's flagship GTX 980 designed to break world records using liquid nitrogen. It comes with an innovative memory heating circuit, which protects against dreaded cold bugs causing memory instability. The card also features a dual-BIOS, voltage measurement and control points.

http://www.techpowerup.com/reviews/ASUS/GTX_980_Matrix/