Green Light -
"The Green Light program requires vendors to send in their board designs to NVIDIA, where they wait for their approval from the GPU maker. NVIDIA will check that the design meets their noise, power, voltage and heat numbers - and if it meets them, the card is approved. If not, it is declined and they'll have to resubmit."
http://www.tweaktown.com/news/26082/nvidia_s_green_light_program_are_we_seeing_the_beginning_of_the_end_of_overclocking_gpus/index.html