MSI GeForce GTX 580 Lightning
 

Three voltage check points for the GPU, Memory and PLL (PCI-Express
interface) are present on the edge of the card, and as mentioned
earlier, MSI include a set of cables that you can attach easily to your
multimeter (not provided) for accurate voltage monitoring while
benchmarking or volt-modding. In addition to those voltage check points,
MSI include their own dual-BIOS switch catering to extreme overclockers
looking to resolve cold bug issues when playing with sub-zero temperatures.

http://www.overclockers.com.au/article.php?id=960315