SONAR is an open source quality management platform, dedicated to continuously analyze and measure source code quality, from the portfolio to the method.
The best benchmark for a piece of graphics hardware is your own actual application, not some marketing benchmark number claimed by some hardware vendor hyping their own hardware.
T. Omori, and K. Maruyama. MSR '08: Proceedings of the 2008 international workshop on Mining software repositories, page 31--34. New York, NY, USA, ACM, (May 2008)